Kelvin and degrees Celsius are friends, though.
I think one is supposed to be radians, not sure why they both have the ° though, cause radians aren’t a degree. Should be just R the way Kelvin is just K.
It is clearly the Rankine scale, which is an absolute temperature scale just like Kelvin. Which means that 0 K and 0 °R is exactly the same.
I know the F C and K, but what are the others?
From John Bazell “In metric, one milliliter of water occupies one cubic centimeter, weighs one gram, and requires one calorie of energy to heat up by one degree centigrade—which is 1 percent of the difference between its freezing point and its boiling point. An amount of hydrogen weighing the same amount has exactly one mole of atoms in it. Whereas in the American system, the answer to ‘How much energy does it take to boil a room-temperature gallon of water?’ is ‘Go fuck yourself,’ because you can’t directly relate any of those quantities.”
I was in a situation similar to this one in real life: having to adjust the salt level in a pool.
In metric:
The pool is 8*4 m long and 2m deep on average, the current salt level is 2g/l and the salt comes in 20kg bags.
How many bags of salts do I need to pour in the pool to adjust the salt level to at least 3g/l ?
Answer:
! The pool contains 8m4m2m= 64m³ or 64000l of water, I need an extra 1g/l of salt per litres so 64000l*1g/l = 64000g or 64 kg. So with 4 bags I’ll have enough salt.
In imperial:
The pool is 20*10ft long and 5ft deep on average, the current salt level is 2000ppm and the salt comes in 40lbs bags.
How many bags of salts do I need to pour in the pool to adjust the salt level to at least 3000ppm?
Answer:
! I’m just gonna drive to the store with my truck to pick up 2 bags at the time and see if it’s enough, no way I’m doing the calculation.
Home pools here are almost never saltwater.
We simply add chlorine tabs until the pH is the correct color on the strips. Even if we knew it would be 62.4 lbs of salt, it’s not like you can buy a 62.4 lb bag of salt.
But yeah, it is a lot harder to do applied math in the US, which is why science here went metric :)
Poor silly creature. Your year has 12 months, each with a different number of days. Your hour has 60 minutes. Your day has 24 hours. If you are critical of inconvenient metrics then you are critical of your own measurement of time. We’re embarrassed for you. :)
Observe: https://metric-time.com/
The French made some attempts at making metric time a thing, but no one really liked it.
Because convenient metrics aren’t strictly better than standardized ones.
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There are 12 months but only 4 differend lenghts
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You use the same system, but i can convert pretty easy from km/h to m/s. Can you calculate from mph/h to ft/s.
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Atleast we can count to 24 and not get overhelmed at the 12
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Time is also funny metric because lenght of day and lenght if year changes slowly all the time
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In grand scale time is also relative measurement
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If metric is so bad why you guys use it when you need to precise
- Correct. Good job!
- I don’t use the same system. Can you calculate “mph/h” (lol) to ft/s?
- Impressive! Good job!
- Time is not a funny metric. The way that we measure time does not change with the seasons.
- What grand scale?
- Who’s we?
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0 Kelvin = 0 Rankine
Also, both °R and °Ra are Rankine. So 3 of the 5 people in the bottom picture also agree.
I think none of K, R, and Ra may be pointing at each other.
Hmm. To my eye, K is obviously pointing at either R or Ra (and F), R has to be pointing at Ra (and K or F), and Ra is pointing at R or K (and C).
And the other two can shake at -40
They shake under the table, but try to keep up appearances.
there’s a whole host of temperature scales, some of which look similar, some look different, some scale the same at the same temperature difference but have different zeroes, and at least one works backwards. Thank goodness there’s only three you’re likely to see in the wild these days, I’d hate to have to keep in mind whether or not those degrees are not Celsius or Fahreheit, but… idk, Newton? Réamur? Rømer? Delisle?
More like only 4 than 3, at least in the us, I unfortunately run into Rankine at my job on occasion.
Welp, it is like Kelvin, just with Fahrenheit step.
°RA sound like the sun’s temperature
1°RA = 5500°C / joking
As far as equations go, “one degree RA equals 5500 degree Celsius divided by joking” is unusually abstract 🤔
Use molecular wiggles mw
Would be better ordered like F° C° K° R°
You mean K° F° C° R°epeat
-40C = -40F
Also 0lbs does not equal 0kg when there’s no gravity.
huh?
Mass doesnt change with gravity
Typically, lbs is not mass, it’s weight/force.
isn’t that lbf?
The pund itself is defined as 0.45359237 Kg
Lbs can be lbf or lbm, but usually is referring to lbf, which is 0.4536 kg at 1g.
when comparing to kg I will assume the mass unit, since comparing a mass value to a force has no meaning.
And temperature doesn’t change with pressure
I’m not sure if you’re joking, but it does. PV=nRT
no mass multiplied with gravity still results in no force, 0 Lb = 0 Kg; 0 Lbf = 0 N
Yes, but 1kg also results in no force, so it’s a trivial statement.
Gravity? What does that have to do with mass
Nothing in this context, but it can have a lot to do with force, for which pounds is the US customary unit.
when compared to a value in Kg, the only logical interpretation is the mass pound. If it were lbf, the si unit conversion would be Newtons.
Having the same name for two different, but easily mixed up units is really annoying haha
It’s clear from context clues that they don’t mean Force. As kilograms are an indicator of mass, not force. It’s not our fault that US’ imperial system is silly.
Imperial is a British thing, and the quantities differ significantly from US customary.
perhaps, but the US uses it.
Nope. As I said, the US customarily uses US customary units. They ARE NOT identical to “Imperial” units, despite the coincidental naming.
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Kelvin is objectively the most accurate. Celsius fans cope.
Er… every system of measurement is accurate, tautologically.
0°F = 0°F because 0°F = 0°F, by definition.
Only Kelvin is valid thermodynamically because thermodynamics often needs absolute temperature for the math to work out right. Rankine is only for masochistic idiots who like fucking up their math and having extra stupid constants all over the place to compensate for their shitty unit system.
Perhaps, but that was not the statement. The statement was:
Kelvin is objectively the most accurate.
Functionally, a measurement system cannot be inaccurate. You might define a new temperature measurement in blargs, and define that the room you’re in right now is 1 blarg. It is now an accurate statement to say that the room is 1 blarg. At the time of measurement, it is not possible for that statement to be inaccurate.
I dunno. I wouldn’t be surprised if somebody took the time to invent fuzzy measurement unities.
I wouldnt call farenheit accurate, but these days it is because its a static number in celcius, which is also an accurate and static measurement that can be repeated billions of times.
Not because 0 is 0 :p
In the original farenheit definition my 0 farenheit was not your 0 farenheit heheTouché but you know what I mean. It’s the most logical to have absolute zero be zero.
Maybe in some scientific settings, but nowhere else. Why would it be logical to use a temperature system in every-day life who’s base is set to a temperature that doesn’t exist on Earth? Celsius and Fahrenheit are human-scale measurements, useful in daily applications. Celsius is a bit more logic-y, and Fahrenheit is intuitive.
But there are multiple that have absolute zero at zero
0°R=0K
Depends on your measuring tool. A thermometer that measures in K but has an error margin of +2 to -2 K is less accurate than a thermometer that measures in F and has an error margin van -0.1 and +0.1 F
It’s a nice day today. Can’t be more than 300 degrees
I’m not so sure
For some reason my brain dropped the ‘L’.
Sitting here wondering how Kevin does it…
I’m coping, Celsius is just as accurate as Kelvin, because it based on it.
Kelvin - 273.15 = Celsius
They’re both calibrated against a stupid wet molecule that carbon based life on this planet is addicted to.
Introducing: the Nihon. 0Nh is the freezing point of Nihonium at 1 bar pressure, and 100Nh is the boiling point. Well, theoretical freezing and boiling points. Nihonium is one of those elements that doesn’t stick around long enough to be studied. But we thought really hard about it, did some shit with particle accelerators, and we’re pretty sure these numbers are good.
The bar is defined to be close to the atmospheric pressure of one random planet called earth, why choose that as your pressure unit?
Fahrenheit is vibe temperature. It just feels good use bigger numbers to describe being very hot. “It’s 30 degrees outside” sounds hot but “it’s 100 degrees outside” is more expressive, like built in exaggeration. That could be why it is preferred by Americans.
30 degrees outside feels very acute.
Farenheit isnt a vibe temperature, its just a bullshit unit of measurment that stuck around in the US.
If you wanted a vibe temperature, why not have 0 be comfortable room temperature and then negatives be colder and positives be warmer?
Or just use Celsius like the rest of the world.
They are called Canadians. The scale works like that for them.
No, it’s just because the US never really converted to the metric system. Degrees Fahrenheit are zeroed at the freezing temperature of brine, and there are exactly 180 degrees from freezing to boiling water because that was an easy number to divide (like the 360 degrees in a circle).
But really it’s because when you’re used to big numbers all your life, why would you limit yourself to puny smaller numbers
Seems like Americans also choose cars by this principle
Hello decimals.
Americans fear them.
To be fair, fractions are inherently superior
Decimals are just fractions for ppl who can only handle dividing by powers of 10
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