Interval vs. Ratio
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.
°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 🤔
-40C = -40F
Also 0lbs does not equal 0kg when there’s no gravity.
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.
Kelvin is objectively the most accurate. Celsius fans cope.
For some reason my brain dropped the ‘L’.
Sitting here wondering how Kevin does it…
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.
It’s a nice day today. Can’t be more than 300 degrees
I’m not so sure
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
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.
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.
This is an argument that gets rolled out a lot but the argument is also based on vibes.
Celcius having zero at freeing is actually useful with weather.
100 being boiling, is also nice for cooking.
The rest is arbitrary, and cope from US customary users who can’t accept that metric is the same or better in every single way.
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
Would be better ordered like F° C° K° R°
You mean K° F° C° R°epeat
Found the Americans.
I kid, but it’s °C, not C°
And K had no degrees at all.
The other two units are not mentioned in this household.
Use molecular wiggles mw
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.
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