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.”
The heat... I mean the cold... well, it’s palpable!
Submitted 1 day ago by NichEherVielleicht@feddit.org to science_memes@mander.xyz
https://feddit.org/pictrs/image/baa7a500-bf79-4630-abd6-e707513cd7b1.jpeg
Comments
FelixCress@lemmy.world 1 day ago
BastingChemina@slrpnk.net 1 day ago
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.
rumba@lemmy.zip 17 hours ago
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 :)
Tattorack@lemmy.world 21 hours ago
Kelvin and degrees Celsius are friends, though.
burntbacon@discuss.tchncs.de 11 hours ago
Not according to the meme. 0 K is -273(.15) C.
dogdeanafternoon@lemmy.ca 18 hours ago
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.
Bob@feddit.org 17 hours ago
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, and the meme doesn’t make a lot of sense.
expatriado@lemmy.world 1 day ago
°RA sound like the sun’s temperature
MasterOKhan@lemmy.ca 1 day ago
1°RA = 5500°C / joking
Viking_Hippie@lemmy.dbzer0.com 1 day ago
As far as equations go, “one degree RA equals 5500 degree Celsius divided by joking” is unusually abstract 🤔
ch00f@lemmy.world 1 day ago
-40C=-40 °F
FiskFisk33@startrek.website 1 day ago
huh?
Mass doesnt change with gravity
ramenshaman@lemmy.world 1 day ago
Lbs is not mass, it’s weight/force.
KeenFlame@feddit.nu 1 day ago
And temperature doesn’t change with pressure
expatriado@lemmy.world 1 day ago
no mass multiplied with gravity still results in no force, 0 Lb = 0 Kg; 0 Lbf = 0 N
ch00f@lemmy.world 1 day ago
Yes, but 1kg also results in no force, so it’s a trivial statement.
Linearity@infosec.pub 1 day ago
Gravity? What does that have to do with mass
SpaceNoodle@lemmy.world 1 day ago
Nothing, but it can have a lot to do with force, for which pounds is the US customary unit.
LibertyLizard@slrpnk.net 1 day ago
Kelvin is objectively the most accurate. Celsius fans cope.
NaibofTabr@infosec.pub 1 day ago
Er… every system of measurement is accurate, tautologically.
marcos@lemmy.world 1 day ago
I dunno. I wouldn’t be surprised if somebody took the time to invent fuzzy measurement unities.
LibertyLizard@slrpnk.net 1 day ago
Touché but you know what I mean. It’s the most logical to have absolute zero be zero.
DacoTaco@lemmy.world 1 day ago
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 heheapplebusch@lemmy.blahaj.zone 21 hours ago
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.
Darkassassin07@lemmy.ca 1 day ago
For some reason my brain dropped the ‘L’.
Sitting here wondering how Kevin does it…
frezik@lemmy.blahaj.zone 1 day ago
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.
FiskFisk33@startrek.website 1 day ago
The bar is defined to be close to the atmospheric pressure of one random planet called earth, why choose that as your pressure unit?
awful_neutral@lemmy.blahaj.zone 1 day ago
It’s a nice day today. Can’t be more than 300 degrees
I’m not so sure
warm@kbin.earth 1 day ago
I'm coping, Celsius is just as accurate as Kelvin, because it based on it.
Kelvin - 273.15 = Celsius
madjo@feddit.nl 1 day ago
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
ChicoSuave@lemmy.world 1 day ago
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.
MisterFrog@lemmy.world 2 hours ago
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.
warm@kbin.earth 1 day ago
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.
SapphironZA@sh.itjust.works 1 day ago
They are called Canadians. The scale works like that for them.
SpaceNoodle@lemmy.world 1 day ago
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).
eletes@sh.itjust.works 1 day ago
But really it’s because when you’re used to big numbers all your life, why would you limit yourself to puny smaller numbers
Tolookah@discuss.tchncs.de 1 day ago
30 degrees outside feels very acute.
omxxi@feddit.org 1 day ago
Would be better ordered like F° C° K° R°
0_0j@lemmy.world 1 day ago
You mean K° F° C° Repeat°
MisterFrog@lemmy.world 3 hours ago
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.
Iron_Lynx@lemmy.world 1 day ago
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?
KittyCat@lemmy.world 21 hours ago
More like only 4 than 3, at least in the us, I unfortunately run into Rankine at my job on occasion.
user224@lemmy.sdf.org 20 hours ago
Welp, it is like Kelvin, just with Fahrenheit step.
sirico@feddit.uk 1 day ago
Use molecular wiggles mw
ArmchairAce1944@discuss.online 21 hours ago
I know the F C and K, but what are the others?
burntbacon@discuss.tchncs.de 11 hours ago
R is to F what K is to C. Ra is used sometimes because there are other R meanings.
Philharmonic3@lemmy.world 2 hours ago
Interval vs. Ratio