Careful, half of what, kelvin?
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That is indeed the joke.
Absolute-ly
Reminds me of a time one of my friends was happy that it was going to warm up and said something like "it's going to be twice as warm tomorrow". It was going from maybe 20F to 40F or something.
That led to an interesting discussion.
Obviously we'd all die but I wonder how exactly. This would make a good question for Randall Munroe.
30°C is 303 Kelvin. Half of that is 151 Kelvin, which translates into a fairly mild -122°C!
Takes out hockey stick
New strategy to prevent global warming: just freeze all of the CO2 out of the air!
I'm dreaming of a white Christmas
mmm, delicious carbonjack
Wait, does it? Are joules in thermal energy per kelvin a purely linear relationship?
Fun fact: gas pressure changes linearly with temperature. If you make one of these plots at mild conditions you can extrapolate the line down to zero pressure and measure where absolute zero temperature is
For the most part, it varies by material and state of matter, but assuming the chemical composition doesnt change and no material changes phase, then it is pretty close to linear in most materials.
Aka a cool 272 Rankine for our US folks.
This knowledge comes in handy with marketing BS around CPU coolers. If an aftermarket cooler gets a CPU to 35C when the stock cooler is at 70C, marketing will sometimes claim it cut temperatures in half.
perhaps it cuts generated temperature in half, ie idle cpu is 50C, stock 70C, and aftermarket 60C
I mean.... that's literally half though
edit: I am not a science man and I am in over my head in this argument
to make the argument even simpler, that phrase wouldn't even mean the same thing to an english person as it would to an american.
In fahrenheit those temps would convert to 95f and 158f.
But °C was mentioned in the units, and its well understood that 0°C is a cold temperature for humans.
I'm not a fan of marketing doublespeak either, but I think the right scale and right terminology was used here. They cut the temperature in half, in Celsius, on the basis that 0°C is very cold.
If you convert those temperatures to Kelvin, they become 308K and 343K. Since Kelvin is absolute and we're measuring the same material, this tells you how much more thermal energy is there and their actual proportion to each other.
thanks, this makes a lot more sense.
That being said, 70C down to 35C is a huge difference, relative to the temperature ranges we live in
It would certainly be a good CPU cooler. Marketing just ran away with claims they can't back up.
Here's an actual example of this sort of thing (starting around 3:22): https://www.youtube.com/watch?v=w8kprUGy57E&t=233s
But it's not.
Celsius and Faernheit are interval scales, not rational scales. The absolute change from one number to the next is consistent, but since you can go into the negatives, 1 is not double 2.
Kelvin and Rankine are rational because they use an absolute zero.
308.15K is not half of 343.15K
I use this as an example for interval vs ratio; you can't halve Celsius because it's an interval scale where zero is arbitrary. Kelvin is ratio as it has an absolute zero-- you very much can halve it and doom near the entire planet next summer
Granted. Celsius now range from 0 to 50
Edit: ... or whatever unit you prefer. It's still the same