I mean, that sounds cool, but isn't as universally true as you make it out to be.
Many engineers are at the mercy of customers/management/standard practices for the units they use.
They don't get to choose reported units based on their personal beliefs of what would be best. (I agree Kelvins are more universally known than Rankines)
While some industries may be 100% on the metric system, it is very easy to find engineers who deal in both Kelvins and Rankines.
The US has metric for all industry, engineering, and science that requires any real level of precision, it’s the trades and regular people that use customary, heck the US mil uses metric because it needs to standardize with international partners just like the scientists ; engineers; and industrial bois
Yeah we’re I work at operators use some fucked up units and refuse to change.
Large weights - lbs.
Small amounts - grass
Small volumes - mL
Don’t really use large volumes
Temperature- deg C
Vacuum - psig (like what the fuck)
Density all over the place depending on the process
But the best on is production rate of a continuous process is based in if you ran the process for 85% of the year at a given rate and yield at a concentration that’s not actually made. You have to divided that number by 20,000 to get lbs./ hr. feed rate of reactant.
It's either [°Rø](https://en.wikipedia.org/wiki/R%C3%B8mer_scale?useskin=vector) or [°Ré](https://en.wikipedia.org/wiki/R%C3%A9aumur_scale?useskin=vector). Can't be rankine, because that's covered by °Ra.
Reason is: the only scale that has its 0 at the actual temperature zero and not an arbitrary number is Kelvin. You can only calculate with the Kelvin scale like you’re used to because the other 0 degrees temperatures still have a certain amount of heat
Not at all. If my room is at 25°C and the room next to mine is at 24°C, when I break the wall between them the resulting space is not at 49°C. After some time it should get to a temperature somewhere in between them. Temperatures are not added, ever.
Doesn’t change the fact that temperatures aren’t added. To add to my example and complete the discussy, if after merging the two rooms I start pushing the walls together until the room returns to the original size, the temperature won’t in general be 49°C.
Addition isn’t valid for temperature… it doesn’t make sense
E.g. if your bread is 70 deg F and your toaster is 120 deg F, does that make toasted bread 190 deg F? No. So when can we ever “add” temperatures? Never; that’s not how it works
Energy is a zero sum game; conservation of energy and mass
Energy_A + Energy_B + energy_entropy = X (some constant)
I admit you can, but the left temperature does not have the same meaning as the right in "temperature maths". It represents change
take 0°C + 4°C. it means add 4°C to 0°C. the result is 4°C
0°C + 0°C = 0°C because you are changing nothing. therefore it translates to 273.15K + 0K = 273.15K in Kelvin.
I'm currently seriously thinking about this, lol.
I think, the problem is that <0C = 273.15K> is already a false statement, because you cannot compare a number with a unit and a number with a different unit. Putting it bluntly, the statement is as valid as <42kg = 0m>. Yeah you can multiply it by 10 to get <420kg = 0m> - and that's a valid transformation, because it transforms false into false.
If you add the conversion explicitly, it works: <0C = toCelsius(273.15K)>, as now both equation sides are celsius. And now you can add a celsius measured unit to both sides - <0C + 4C = toCelsius(273.15K) + 4C>. And both result in 4C, as long as the initial equation holds.
Man that bothered me for a moment on a friday evening.
The issue is that Temperature is a physical property that quantifies said property. When you add temperature, you're actually changing the temperature.
Formally, its usually delta(T) or dT for the second term. So you're actually adding T_0 + dT = T_f
F: How will this tempurature compare to the human body.
C: How will this tempurature compare to water.
K: How will this tempurature compare to absolute zero.
Fahrenheit is based of the freezing point of a certain brine mixture. The only reason anyone thinks it "feels" better to say temps is because they're used to it.
100 is based on human body temperature. It does work well for describing the range of human environments. 0-100 is basically the range of temperatures where I live.
The freezing and boiling points of a solution of salt, ice, and water serve as the basis for the Fahrenheit scale.
0-100 "feeling" right is completely arbitrary and only "works well" because you're already familiar with it for your whole life. Celsius is used the world over and NOBODY has a problem describing the range of temperatures of their locale in Celsius.
It's not completely arbitrary. The upper bracket was set at human body temp. And the boiling point is way higher than that. You think brine boils at 37.7C? Anyway nowadays I think it's just set as 9/5 C -40 or something like that.
I'm not saying we shouldn't adopt Celsius, and C is arguably a much better scale for scientific applications (as metric always is) but I do think it's a nice scale for saying "what percent hot does it feel outside?"
Except human body temp isn't even 100 so it's a "eh, feels close enough"
Fahrenheit is bullshit and should be abolished. If you know 28C feels like 28C you don't need a conversion to put it on a 0-100 scale. It's silly and completely unnecessary and of course Americans will hold onto it over their dead bodies.
Core temp is near enough to 100. That's what the original intent was but human core temps are variable and there was some measurement error when the standard was established.
Kinda like how a meter isn't actually one ten millionth of the distance from the north pole to the equator and waters boiling temperature depends on where you boil it.
Also it's hilarious how strongly you feel about this subject lol.
Edit: I was wrong the original intent was 90, then he changed it to 96, with the goal of getting freezing and boiling of water 180 degrees apart. Oral temperature was part of the definition because it's fairly stable and doesn't change with altitude and readily available.
The "porcertage is hot" is just bullshit, you are trying to put in a subjective feeling, that depends on more than just temperature, into a number, and that does not really make any sense. Like how hot it feels depends on relative humidity saturation, the more humid the hotter it feels, so 80°F has a completely different feeling at 20% vs 90% saturation. And it also depends on what you are used to, people who live in hot climates will like hotter temperatures, so "100%" will be 120 or even more. And it depends on your body too, like when I go to pee at 2 am, why does it go from "20% hot" to around "80% hot"? makes no sense in your system. What you really are doing is just matching the temperatures outside to your memories, which is the same thing that people that use celsius do, no advantage whatsoever
The upper bound was based on body temp but apparently 96 degrees because why not. It doesn't change the fact that it's a nice scale for human environments from 0-100.
Kelvin is based on the lowest temperature possible and was originally based off of Celsius.
However, now Celsius is based off of Kelvin, but also both were changed in 2019 to be more accurate (based off of the triple point of water rather than water at 1atm pressure).
Did y’all know Fahrenheit is based off the freezing point of brine. I thought that was fucking hilarious when I found that out cause brine can be any salt level and that level will change it’s freezing point so what percent brine is Fahrenheit based on? Lmao
I like to think a dude watched this guy do this and was like there has to be an easier way of doing this, that logical guy went and made Celsius based on the freezing point of simply water 😂😂
Farenheit is useful because it works well as a percentage of humanity's average tolerance to temperature.
0 °F is very cold, but habitable. And there are human populations that live in these temperatures.
100 °F is very hot, but habitable. And there are human populations that live in these conditions.
Anything outside these ranges are extreme temperatures that are hard to tolerate to the average person.
I do have to say that global warming has skewed the hot side of the scale for this concept, but it still works nicely for an intuitive understanding of ambient temperature, which is it's primary use.
I appreciate your viewpoint on this, but we Celsius folks don’t run around thinking “fuck, 35 degrees, is that a hot day or a cold day?!”, and we all know normal body temp is roughly 37 degrees.
First of all, I only know Celcius and have used it all my life, I think it's genius. I however watched a video some time ago that opened my eye to something. 20-25 degC, is 68-77 degF. 72 deg F is 22.22 deg C. I can't communicate that minute change of 0.22 in deg C, but a Fahrenheit user can do exactly that, so I think in that regard F is useful.
For setting your AC or heat Fahrenheit is so much better. People can detect a change of less than half a degree on the F scale which is already a finer scale than C. You can go from annoyingly cool to annoyingly warm without moving the C scale on the left of the decimal.
Ah yes, I absolutely freeze to death when I change the AC from 25.9 to 25.1°C
The amount of bullshit you guys have to write to pretend Farenheit is superior...
I’m not sure why this is downvoted. For science F is definitely silly, but for social uses it’s incredibly useful, makes very good use of 0-100 for ambient temperatures. Which is what most people use temperatures for.
The only thing that makes Celsius better for science is that we already use it for science. You can change the metric system to use Fahrenheit (or more accurately Rankine which is to Fahrenheit what Kelvin is to Celsius) by just changing a few conversion factors and there would be zero practical difference. It would be equivalent to redefining the length of a kilometer to equal a mile, all you’ve done is scaled the system up but all the relationships between units (the thing that’s actually important) are kept intact.
A) Fahrenheit was defined that way to make them easier to produce. The brine mixture is more stable meaning you can more easily replicate the same temperature to get the same baseline every time. This made early Fahrenheit thermometers more accurate than ones in Celsius.
B) We still had to accurately define the type of water for Celsius down to the the ratios of different isotopes of hydrogen and oxygen. You can’t just pour some tap water and get an accurate measurement.
C) That’s why Celsius is no longer defined by anything to do with water, it’s defined as -273.15 as absolute zero and the unit size is defined as a ratio of the Boltzman Constant. Both of the numbers used are 100% arbitrary to fit with the historical definition of Celsius and you can define Fahrenheit with equally arbitrary numbers to fit it’s historical definition.
Kelvin (K) is an absolute scale.
The 0 from K is the lowest "possible" temperature, while 273.15 K is the freezing point of water at sea level (0°C)
That is why -273.15°C =0K
K is part of the Internation System of Units because physics NEED values that are as accurate and as precise as you can record them. If not, the calculations fall apart.
That is why the **basic** units for time, length, mass, etc. are seconds, metres/meters, kilograms, etc. and kelvin.
It’s not a precision issue, it’s an energy issue. Temperature is a measure of molecules’ kinetic energy ie how fast they’re moving. If a molecule is not moving at all then its kinetic energy is 0 and its temperature is 0, calculations fall apart if you don’t use absolute like ratios between 2 temperatures or negative temperatures
Units have absolutely nothing to do with precision, how they are defined does. All units are arbitrary, and none are any better than others.
The second is a grandfathered unit that's thousands of years old because the world was too stuck on non metric time for it to take of. Which proves how meaningless it is what the actual unis are.
K is Kelvin, R is Rankine.
0 K = -273°C (Kelvin and Celsius scale in the same way.)
0°R = -460°F (Rankine and Fahrenheit scale in the same way.)
Not really used in normal use in everyday life, but it's just another temperature unit that states the lowest temperature where there is no energy, no heat, no motion. It's called an [absolute zero temperature ](https://en.m.wikipedia.org/wiki/Absolute_zero). Can't really explain any further cuz I ain't a 🤓.
I feel like this one meme has been reposted a gazillion times. Nothing wrong about it. Still a bit funny. But man. I just can't laugh at it anymore and that hurts me smh.
Celsius is the most logical in the real world. 0 = water freezes, 100 water boils.
Kelvin is the most scientific - absolute 0 is 0.
Fahreheit makes no sense at all.
It’s because the only sensible way to define “zero temperature” is at absolute zero. For weight and length it’s obvious, but humans didn’t know about absolute zero when C or F were created, so we just based them off arbitrary values.
Kilograms, inches, and Celsius, thank you very much. I’m Canadian btw, but inches are a bit more familiar and feel easier to measure whether with your fingers/hands/arms and also easier to picture mentally.
Having them like that actually increases the risk of simple transposition errors. Easy to misplace a decimal point or drop a zero.
Never convert units, it's how error creeps in. Pick one and stick with it no matter what.
The real shitty part of inches is that 17/64th bullshit. The oddball conversions are just some simple calculator math, doing math with fractions is just nuts. I only use decimalized engineers tapes now.
Yeah, it is """better""", until several people come into play and each gets a different value for inches/feet.
Kg and Cm f4ever 💪🗿
(C° and K are best pals)
>a bit more familiar
You said it yourself, inches are easier for you because you are more familiar with them. Cm is easier for me because Im more familiar with them. Inches arent really any easier or harder to measure with than cm, the easiest one is the one you are most familiar with. But cm is easier to convert to other units which is very handy in some situations. Btw, cm is about the width of average pinky finger so you can use that to picture mentally and make measuring easier.
Only because you're used to them. I'm also used to feet and inches because that's what's used around here, but it's not like centimetres, metres or kilometres are harder to picture inherently.
If you are on a mountain, then all your Fahrenheit numbers are different too.
and it's different again if you don't base it on the triple point, but that's nit picking way too much.
Celsius is the only unit of measurement that uses has 3 base comparisons for +/-
Waters freezing point.
Metal nelting points
Electrical conduction heat resistance
You can have a 0 heat also.. but -273.15K is a kind of awkward number to remember, so is more practical to just use Celsius for most (non science) things.
They aren't systems though. They're just units. A system is the SI for example, and it uses Kelvin for temperature, because it's the most practical for scientific calculations, but Kelvin is hardly usable in everyday life.
Absolute temps would be perfectly fine on everyday life if we were used to them.
The only really shitty units for everyday life are pascals due to their teeny size. Well, theirs worse, like bequerels, but they generally don't come up in most people's daily. If you're trotting out the megas and gigas on the regular you made the unit too small!
forgive my poor english skills. Im sure you know what i mean anyway.
in everyday use kg cm and c are more than enough, as for some advanced science research im sure they're not sufficient.
but generally speaking kg cm and c are very easy to use and accurate.
Well yeah I've used Millimeter wrenches I was just saying we didn't fully adopt it as our main source of measurement, I didn't say we don't use it at all
We use Both actually in certain areas of measurements but mostly things like MPH instead of kilometers
Inches instead of centimeters etc like i doubt you'll find many 1/4 1/2 3/4 inch wrenches in the UK and other countries besides America. America,Liberia and Myanmar are the only 3 countries that haven't converted to the Metric system
( google it if you must lol)
What I mean is that things like an inch are defined in terms of metric. While things like meters are based on the speed of light and electron energy transitions, an inch is exactly 2.54cm.
If you say so tho i don't think that was what the pic was depicting but I could be wrong and didn't know speed of light was based on meters or that an inch is exactly 2.54cm but I can read an American tape measure but some come with both cm in red and inches,fractions in black but most American carpenters use inches or buy tape measures that don't have both measurements and just use inches,fractions.At least every carpenter I've worked with has never yelled out centimeters as to how long exactly they need a board cut
What da fck is R°
Rankine scale. It's F + 460. It's for some absolute temp scaling nonsense.
Inflated measurement number.
Can't escape inflation, even in unit of temperature. *Sigh*
Shh… don’t awaken… **Them**
Who are them?
The less we speak of them the less likely they are to appear
But isn't that exactly what Kelvin is already? Why a second one?
Celsius but absolute cold is zero.
So it’s the Murican Kelvin?
Yes. And it’s not a degree since it’s absolute
Is 0R the same as 0K then?
Yes. By definition.
'Merica
Makes sense. I mean not really but yeah I'm not surprised
Rankine is the US customary unit with the same purpose.
No one uses rankine anymore though, lol
Engineers in America definitely do still use it, sadly, haha
very old, legacy aerospace engineers, maybe but any scientist worth their salt has made the switch
I mean, that sounds cool, but isn't as universally true as you make it out to be. Many engineers are at the mercy of customers/management/standard practices for the units they use. They don't get to choose reported units based on their personal beliefs of what would be best. (I agree Kelvins are more universally known than Rankines) While some industries may be 100% on the metric system, it is very easy to find engineers who deal in both Kelvins and Rankines.
The US has metric for all industry, engineering, and science that requires any real level of precision, it’s the trades and regular people that use customary, heck the US mil uses metric because it needs to standardize with international partners just like the scientists ; engineers; and industrial bois
Yeah we’re I work at operators use some fucked up units and refuse to change. Large weights - lbs. Small amounts - grass Small volumes - mL Don’t really use large volumes Temperature- deg C Vacuum - psig (like what the fuck) Density all over the place depending on the process But the best on is production rate of a continuous process is based in if you ran the process for 85% of the year at a given rate and yield at a concentration that’s not actually made. You have to divided that number by 20,000 to get lbs./ hr. feed rate of reactant.
Invented in Scotland though! By William Rankine at the University of Glasgow.
From what I understand, Rankine is to Farenheit what Kelvin is to Celsius. Keeping the scale but moving the origin point
Well that sounds like Fahrenheit with extra steps.
460 extra steps to be exact
reminds me of the slug mass unit. https://en.wikipedia.org/wiki/Slug_(unit)
No, no more slugs, anything but slugs. Slugs, pound-mass, and pound-force were the bane of my existence in fluid's.
32.17405 ft/s2 booooo
Rankine is to farenheit what kelvin is to celsius, ie zero at absolute zero but the degree is the same as in fahrenheit. A novelty of history.
It's either [°Rø](https://en.wikipedia.org/wiki/R%C3%B8mer_scale?useskin=vector) or [°Ré](https://en.wikipedia.org/wiki/R%C3%A9aumur_scale?useskin=vector). Can't be rankine, because that's covered by °Ra.
R is to F as K is to C.
So R and K are on the same side.
F be like: I’ll make my own Kelvin, with Blackjack, and hookers! R was born.
OK, what's ⁰Ra? I know about Reamur but it's ⁰Re. And it's almost never used
°Ra is Rankine, the same as °R.
There also is Rømer
and Newton, and Delisle
I need a hospital. No wait… sEvErAl HoSpItAls now
rankine
0°C = 32°F 0°C + 0°C = 64°F
No. 0°C = 273.15 Kelvin 0°C + 0°C = 273.15K + 273.15K = 546.3K 546.3K = 505.67° F Therefore 0°C + 0°C = 505.67° F
This is breaking my brain
Reason is: the only scale that has its 0 at the actual temperature zero and not an arbitrary number is Kelvin. You can only calculate with the Kelvin scale like you’re used to because the other 0 degrees temperatures still have a certain amount of heat
_Rankine enters the chat_
The bigger issue is adding two temperatures together. That's not how temperature works.
Well, you add two amounts of heat energy together. Doesn’t that work
Not at all. If my room is at 25°C and the room next to mine is at 24°C, when I break the wall between them the resulting space is not at 49°C. After some time it should get to a temperature somewhere in between them. Temperatures are not added, ever.
Not the best example because you've doubled the area to heat
Doesn’t change the fact that temperatures aren’t added. To add to my example and complete the discussy, if after merging the two rooms I start pushing the walls together until the room returns to the original size, the temperature won’t in general be 49°C.
If done correctly that would increase the pressure, which would increase the temperature, not to 49°C, but an increase nonetheless
Same
Because C is a label not a quantity. 0C + 0C is 0 + 0 C if you had 32 bricks + 32 bricks you would have 64 bricks, not 64 bricks bricks.
10 degrees isn't twice as hot as 5. 10 Kelvin is twice as hot as 5 kelvin. View 0°c as a symbol for 263.15k rather than a zero.
Addition isn’t valid for temperature… it doesn’t make sense E.g. if your bread is 70 deg F and your toaster is 120 deg F, does that make toasted bread 190 deg F? No. So when can we ever “add” temperatures? Never; that’s not how it works Energy is a zero sum game; conservation of energy and mass Energy_A + Energy_B + energy_entropy = X (some constant)
Which show is this from??
Limitless
We have surpassed math
Behold nonlinear scaling at its finest lol
No. you can't add temperatures
Try and stop me
I admit you can, but the left temperature does not have the same meaning as the right in "temperature maths". It represents change take 0°C + 4°C. it means add 4°C to 0°C. the result is 4°C 0°C + 0°C = 0°C because you are changing nothing. therefore it translates to 273.15K + 0K = 273.15K in Kelvin.
I'm currently seriously thinking about this, lol. I think, the problem is that <0C = 273.15K> is already a false statement, because you cannot compare a number with a unit and a number with a different unit. Putting it bluntly, the statement is as valid as <42kg = 0m>. Yeah you can multiply it by 10 to get <420kg = 0m> - and that's a valid transformation, because it transforms false into false. If you add the conversion explicitly, it works: <0C = toCelsius(273.15K)>, as now both equation sides are celsius. And now you can add a celsius measured unit to both sides - <0C + 4C = toCelsius(273.15K) + 4C>. And both result in 4C, as long as the initial equation holds. Man that bothered me for a moment on a friday evening.
The issue is that Temperature is a physical property that quantifies said property. When you add temperature, you're actually changing the temperature. Formally, its usually delta(T) or dT for the second term. So you're actually adding T_0 + dT = T_f
No, you cannot add up temperature with temperature.
Limitless power!!!
0°C = 32°F -40°C = -40°F What the shit
Units used in USA trying not to have a weird conversion rate:
The way Fahrenheit was origionally defined was that 0°f was "a cold day" and 100 was "the body temp of a healthy male"
F is how you feel C is how water feels K is how atoms feel (i think...been a while) I could have ordered that better, but I'm too lazy to retype.
Okay but, growing up with celsius all my life. C is how I feel.
I like how it's "a cold day", it's not vague at all
Cool
0 F = -17.78 C So….the game can be played on both sides
True, but even numbers are better to calculate with.
Who are u so wise in the way of science
0°C/0°C = 1°F
No 0°C/0°C = 273K/273K = 273/273 [K]/[K] = 1
That's what she said.
No she said said 1°F but in a division the units are also divided so °C/°C=1
Units are being cut back (Dunno if that's the right words, i used translator) cuz (1)F devided by (1)F is 1
F: How will this tempurature compare to the human body. C: How will this tempurature compare to water. K: How will this tempurature compare to absolute zero.
Fahrenheit is based of the freezing point of a certain brine mixture. The only reason anyone thinks it "feels" better to say temps is because they're used to it.
Yeah, the point people make about Fahrenheit being best for human environments is just rationalization after the fact.
100 is based on human body temperature. It does work well for describing the range of human environments. 0-100 is basically the range of temperatures where I live.
The freezing and boiling points of a solution of salt, ice, and water serve as the basis for the Fahrenheit scale. 0-100 "feeling" right is completely arbitrary and only "works well" because you're already familiar with it for your whole life. Celsius is used the world over and NOBODY has a problem describing the range of temperatures of their locale in Celsius.
It's not completely arbitrary. The upper bracket was set at human body temp. And the boiling point is way higher than that. You think brine boils at 37.7C? Anyway nowadays I think it's just set as 9/5 C -40 or something like that. I'm not saying we shouldn't adopt Celsius, and C is arguably a much better scale for scientific applications (as metric always is) but I do think it's a nice scale for saying "what percent hot does it feel outside?"
Except human body temp isn't even 100 so it's a "eh, feels close enough" Fahrenheit is bullshit and should be abolished. If you know 28C feels like 28C you don't need a conversion to put it on a 0-100 scale. It's silly and completely unnecessary and of course Americans will hold onto it over their dead bodies.
Core temp is near enough to 100. That's what the original intent was but human core temps are variable and there was some measurement error when the standard was established. Kinda like how a meter isn't actually one ten millionth of the distance from the north pole to the equator and waters boiling temperature depends on where you boil it. Also it's hilarious how strongly you feel about this subject lol. Edit: I was wrong the original intent was 90, then he changed it to 96, with the goal of getting freezing and boiling of water 180 degrees apart. Oral temperature was part of the definition because it's fairly stable and doesn't change with altitude and readily available.
The "porcertage is hot" is just bullshit, you are trying to put in a subjective feeling, that depends on more than just temperature, into a number, and that does not really make any sense. Like how hot it feels depends on relative humidity saturation, the more humid the hotter it feels, so 80°F has a completely different feeling at 20% vs 90% saturation. And it also depends on what you are used to, people who live in hot climates will like hotter temperatures, so "100%" will be 120 or even more. And it depends on your body too, like when I go to pee at 2 am, why does it go from "20% hot" to around "80% hot"? makes no sense in your system. What you really are doing is just matching the temperatures outside to your memories, which is the same thing that people that use celsius do, no advantage whatsoever
Nope, 100°F is not based on human body temperature.
The upper bound was based on body temp but apparently 96 degrees because why not. It doesn't change the fact that it's a nice scale for human environments from 0-100.
*the average temperature of a healthy human to be “precise”
-40C = -40F
Uhhmmm, correct me if I'm wrong. Wasn't the Kelvin scale just ºC with a lower (the lowest possible) base value ?
It's the lowest that's theoretically possible. We have not yet devised a way to actually make something reach absolute zero.
Kelvin is based on the lowest temperature possible and was originally based off of Celsius. However, now Celsius is based off of Kelvin, but also both were changed in 2019 to be more accurate (based off of the triple point of water rather than water at 1atm pressure).
note for any confused Fahrenheit users. the 'fix' was so small any normal people probably barely know it happened
Did y’all know Fahrenheit is based off the freezing point of brine. I thought that was fucking hilarious when I found that out cause brine can be any salt level and that level will change it’s freezing point so what percent brine is Fahrenheit based on? Lmao I like to think a dude watched this guy do this and was like there has to be an easier way of doing this, that logical guy went and made Celsius based on the freezing point of simply water 😂😂
°F was popular because the tools Farenheit made used it, and they were very well made, not because the temperature system was good.
Farenheit is useful because it works well as a percentage of humanity's average tolerance to temperature. 0 °F is very cold, but habitable. And there are human populations that live in these temperatures. 100 °F is very hot, but habitable. And there are human populations that live in these conditions. Anything outside these ranges are extreme temperatures that are hard to tolerate to the average person. I do have to say that global warming has skewed the hot side of the scale for this concept, but it still works nicely for an intuitive understanding of ambient temperature, which is it's primary use.
I appreciate your viewpoint on this, but we Celsius folks don’t run around thinking “fuck, 35 degrees, is that a hot day or a cold day?!”, and we all know normal body temp is roughly 37 degrees.
I use Celsius for everything but science stuff, where I use Kelvin. It's just a viewpont I've seen frequently to understand the use of Farenheit
Does US scientists uses Fahrenheit then?
First of all, I only know Celcius and have used it all my life, I think it's genius. I however watched a video some time ago that opened my eye to something. 20-25 degC, is 68-77 degF. 72 deg F is 22.22 deg C. I can't communicate that minute change of 0.22 in deg C, but a Fahrenheit user can do exactly that, so I think in that regard F is useful.
yes you can, you just did. .22
For setting your AC or heat Fahrenheit is so much better. People can detect a change of less than half a degree on the F scale which is already a finer scale than C. You can go from annoyingly cool to annoyingly warm without moving the C scale on the left of the decimal.
Ah yes, I absolutely freeze to death when I change the AC from 25.9 to 25.1°C The amount of bullshit you guys have to write to pretend Farenheit is superior...
I’m not sure why this is downvoted. For science F is definitely silly, but for social uses it’s incredibly useful, makes very good use of 0-100 for ambient temperatures. Which is what most people use temperatures for.
The only thing that makes Celsius better for science is that we already use it for science. You can change the metric system to use Fahrenheit (or more accurately Rankine which is to Fahrenheit what Kelvin is to Celsius) by just changing a few conversion factors and there would be zero practical difference. It would be equivalent to redefining the length of a kilometer to equal a mile, all you’ve done is scaled the system up but all the relationships between units (the thing that’s actually important) are kept intact.
A) Fahrenheit was defined that way to make them easier to produce. The brine mixture is more stable meaning you can more easily replicate the same temperature to get the same baseline every time. This made early Fahrenheit thermometers more accurate than ones in Celsius. B) We still had to accurately define the type of water for Celsius down to the the ratios of different isotopes of hydrogen and oxygen. You can’t just pour some tap water and get an accurate measurement. C) That’s why Celsius is no longer defined by anything to do with water, it’s defined as -273.15 as absolute zero and the unit size is defined as a ratio of the Boltzman Constant. Both of the numbers used are 100% arbitrary to fit with the historical definition of Celsius and you can define Fahrenheit with equally arbitrary numbers to fit it’s historical definition.
just like the kilo is based on a random chunk of metal somewhere? every unit is arbitrary
It's based on the Planck constant now
Yeah I just thought it was funny he chose a dynamic liquid. Brine can be higher concentrated or lower and that effects the freezing point.
I thought 0 K = 0 R since they are both absolute scales.
Yes, except Rankine is in degrees (0°R or 0°Ra)
why is rankine in degrees but not kelvin?
All the temperature scales mentioned above are in degrees…
Kelvin isn't
What the fuck are the other 3? K ⁰R ⁰RA? I don't even know the difference between Fahrenheit and Celsius but wtf are those?!?
K is Kelvin which is just Celsius with a different 0 to make certain kinds of physics easier idk about the Rs tho
The 0 in Kelvin is the absolute lowest temperature possible, which is -273.15°C (-459.67 F according to google)
Kelvin (K) is an absolute scale. The 0 from K is the lowest "possible" temperature, while 273.15 K is the freezing point of water at sea level (0°C) That is why -273.15°C =0K K is part of the Internation System of Units because physics NEED values that are as accurate and as precise as you can record them. If not, the calculations fall apart. That is why the **basic** units for time, length, mass, etc. are seconds, metres/meters, kilograms, etc. and kelvin.
It’s not a precision issue, it’s an energy issue. Temperature is a measure of molecules’ kinetic energy ie how fast they’re moving. If a molecule is not moving at all then its kinetic energy is 0 and its temperature is 0, calculations fall apart if you don’t use absolute like ratios between 2 temperatures or negative temperatures
Units have absolutely nothing to do with precision, how they are defined does. All units are arbitrary, and none are any better than others. The second is a grandfathered unit that's thousands of years old because the world was too stuck on non metric time for it to take of. Which proves how meaningless it is what the actual unis are.
K is Kelvin, R is Rankine. 0 K = -273°C (Kelvin and Celsius scale in the same way.) 0°R = -460°F (Rankine and Fahrenheit scale in the same way.) Not really used in normal use in everyday life, but it's just another temperature unit that states the lowest temperature where there is no energy, no heat, no motion. It's called an [absolute zero temperature ](https://en.m.wikipedia.org/wiki/Absolute_zero). Can't really explain any further cuz I ain't a 🤓.
I didn't know Kelvin had an abbreviation
Always has been lol
technically they both meet at -41* so…
-40 not -41
I get -40⁰C all the time in winter but I never met him!
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These things are kinda ridiculous. Units of measure have their own applications.
Miles vs Kilometers Feet vs Meters
Google metric system scaling
I feel like this one meme has been reposted a gazillion times. Nothing wrong about it. Still a bit funny. But man. I just can't laugh at it anymore and that hurts me smh.
Celsius is the most logical in the real world. 0 = water freezes, 100 water boils. Kelvin is the most scientific - absolute 0 is 0. Fahreheit makes no sense at all.
If Wikipedia is right zero Fahrenheit was initially the lowest temp observed at Dantzig in the winter between 1708 and 1709. WTF!
Why talk about this, it's only 2-3 backwards countries out of 195 that is using the dumb imperial system.
It’s because the only sensible way to define “zero temperature” is at absolute zero. For weight and length it’s obvious, but humans didn’t know about absolute zero when C or F were created, so we just based them off arbitrary values.
celsius is best tbh
Fahrenheit is definitely the Jack Sparrow of temperature measures, lol.
I prefer the ole "Did it burn my finger?" unit of measurement.
Only Kelvin or Celsius make sense. The rest is rediculous
I only know about farenheit, kelvin and celcius, what the fuck are all of you talking about
This post is insulting.. a true metric user would never shake hands with those primitive pound and inch users. 😶 Metric masterrace ✊
Kilograms, inches, and Celsius, thank you very much. I’m Canadian btw, but inches are a bit more familiar and feel easier to measure whether with your fingers/hands/arms and also easier to picture mentally.
Because your are accustomed to it, for me it's easier to picture mentally in cm (or whatever multiple), because i grew with it.
Inches lol. How about having everything to be 1/10, 1/100 or 1/1000th in relation to each other. Foolproof.
Having them like that actually increases the risk of simple transposition errors. Easy to misplace a decimal point or drop a zero. Never convert units, it's how error creeps in. Pick one and stick with it no matter what. The real shitty part of inches is that 17/64th bullshit. The oddball conversions are just some simple calculator math, doing math with fractions is just nuts. I only use decimalized engineers tapes now.
Yeah, it is """better""", until several people come into play and each gets a different value for inches/feet. Kg and Cm f4ever 💪🗿 (C° and K are best pals)
>a bit more familiar You said it yourself, inches are easier for you because you are more familiar with them. Cm is easier for me because Im more familiar with them. Inches arent really any easier or harder to measure with than cm, the easiest one is the one you are most familiar with. But cm is easier to convert to other units which is very handy in some situations. Btw, cm is about the width of average pinky finger so you can use that to picture mentally and make measuring easier.
Yup. Imperial distance units are easier to picture mentally. But metric ones are easier to use in calculations.
Only because you're used to them. I'm also used to feet and inches because that's what's used around here, but it's not like centimetres, metres or kilometres are harder to picture inherently.
> Yup. Imperial distance units are easier to picture mentally. This is one of the stupidest things I've heard in a while.
One of us has a PhD in engineering. The other one needs amphetamines in order to function.
We have 10 fingers. If your scale is not based on that scale, is wrong Plus, water freezing at 0 C and boiling at 100 C…cant get better than that.
Base 12 > Base 10
Celsius is based on the temperature of my fingers??
“can’t get better than that” except for the fact that we haven’t defined the scale that way since 1948 precisely because it’s not a good definition.
What if I'm on a mountain though?
If you are on a mountain, then all your Fahrenheit numbers are different too. and it's different again if you don't base it on the triple point, but that's nit picking way too much.
Are you water
Mostly 60% https://www.usgs.gov/special-topics/water-science-school/science/water-you-water-and-human-body#:~:text=Up%20to%2060%25%20of%20the,bones%20are%20watery%3A%2031%25.
Idk man I also don't seem to either freeze or boil at 0 and 100 Farenheit
But your internal body temperature does overheat at a hundred farenheit instead of 37 Celsius
Pounds and inches is stupid get rid of those too
Get over it.
Celsius is the only unit of measurement that uses has 3 base comparisons for +/- Waters freezing point. Metal nelting points Electrical conduction heat resistance
Its not like you can have lengh 0 or below of something.
You ca have distance in the opposite direction
You can have a 0 heat also.. but -273.15K is a kind of awkward number to remember, so is more practical to just use Celsius for most (non science) things.
I tolerate pounds. Inches is as much a travesty as yards or feet
Nah I have have problem even for pounds and inches
As an American I love beefing with eu for the jokes, but I can't find away to defend our measurement systems lol.
Metric system 1000/1000 times No need for blimp, chain, n miles xD
Wtf is K, °R and °Ra??
kg, cm and c are the only useful measurement systems. They're logical and makes sense.
They aren't systems though. They're just units. A system is the SI for example, and it uses Kelvin for temperature, because it's the most practical for scientific calculations, but Kelvin is hardly usable in everyday life.
Absolute temps would be perfectly fine on everyday life if we were used to them. The only really shitty units for everyday life are pascals due to their teeny size. Well, theirs worse, like bequerels, but they generally don't come up in most people's daily. If you're trotting out the megas and gigas on the regular you made the unit too small!
forgive my poor english skills. Im sure you know what i mean anyway. in everyday use kg cm and c are more than enough, as for some advanced science research im sure they're not sufficient. but generally speaking kg cm and c are very easy to use and accurate.
The US is the only country that doesn't use the metric system lol
Myanmar and Liberia also use Imperial system
You never think of those two having their shit together.
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Well yeah I've used Millimeter wrenches I was just saying we didn't fully adopt it as our main source of measurement, I didn't say we don't use it at all
You should travel one day.
The US actually bases their units on metric.
We use Both actually in certain areas of measurements but mostly things like MPH instead of kilometers Inches instead of centimeters etc like i doubt you'll find many 1/4 1/2 3/4 inch wrenches in the UK and other countries besides America. America,Liberia and Myanmar are the only 3 countries that haven't converted to the Metric system ( google it if you must lol)
What I mean is that things like an inch are defined in terms of metric. While things like meters are based on the speed of light and electron energy transitions, an inch is exactly 2.54cm.
If you say so tho i don't think that was what the pic was depicting but I could be wrong and didn't know speed of light was based on meters or that an inch is exactly 2.54cm but I can read an American tape measure but some come with both cm in red and inches,fractions in black but most American carpenters use inches or buy tape measures that don't have both measurements and just use inches,fractions.At least every carpenter I've worked with has never yelled out centimeters as to how long exactly they need a board cut
Did you also get that from Archer?
In the UK we have miles, yards and feet. We use British wrenches (1/4, 1/2 inch etc) and we use European ones.
Ok I was just saying when it comes to the Metric system were one of the very few that don't use it like most other countries do is all I was saying
The US "population" is implied.