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!
Dry snow doesn't sound like too bad of a proposition on its own.
I'm dreaming of a white Christmas
That's one of the ways proposed for terraforming Venus. Put in a sun shield to freeze the planet, let the CO2 snow down, then process the CO2 into something that can sequester it away so it doesn't just go back into the atmosphere after removing the sun shield.
Of course none of that is technically possible right now, but it's a lot easier on a planet that has no (known) life to destroy while working through the process.
the sequestering step is actually kinda easy, it's the sun shield that's the hard part
Aka a cool 272 Rankine for our US folks.
I would be willing to bet there are more people in the US using Kelvin in their jobs than Rankine.
Lb-mole? That one I'm not sure.
To me, these wanna-be scientific units are weird, like, just use metric at that point 😅
Also 1000th of an inch. Like, come on! You're just teasing us
Wait, does it? Are joules in thermal energy per kelvin a purely linear relationship?
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.
hmm but there will surely be a lot of phase changes with a drop in energy so substantial. we need our top scientists on this asap
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
Careful, half of what, kelvin?
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.
Granted. Celsius now range from 0 to 50
Edit: ... or whatever unit you prefer. It's still the same
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.
I mean.... that's literally half though
edit: I am not a science man and I am in over my head in this argument
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.
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.
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.
308.15K is not half of 343.15K
Do you also say "the temperature in the freezer has doubled" when it goes from -12°C to -24°C? Not saying that would be disingenuous with your arguments.
Usually that should mean it cuts the difference ambiant and CPU in half. Anything else would just be stupid or a lie.
Obviously we'd all die but I wonder how exactly. This would make a good question for Randall Munroe.
90 F to Kelvin, halved and converted back, is approximately -190.
It's difficult to find data on what exposure to that temperature would do, the threshold for an extreme cold warning (meaning absolutely do not go outside without heavy protection unless you want necrotic frostbite) is about 150 F warmer than that.
It depends on conductive and convective transfer at that point. The atmosphere would be vastly different as that's well below the point where CO2 would snow out but you should still have enough gasses to flash freeze you.
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
Doom near the entire planet
Next Summer
Coming to theaters near you
Probably want it between the winter temperature and the current summer temperature, but genies are traditionally fickle and pounce on any ambiguity
A good genie would instantly invent a metric of "number of degrees in excess of room temperature"
I think it's fairly well known that there are no good genies. But otherwise, true.
Is the temperature scale directly proportional to the heat energy? I think the amount of energy needed to raise water by 1 degree is the same no matter the starting temperature for example. Is 100°K double the heat energy of 50°K?
Kelvin doesn’t have degrees btw you just say 50K or 100K because it’s an absolute temperature scale as opposed to an arbitrary or relative one like Fahrenheit or Celsius. I’d expect that the energy would be double though that’s more of a feeling.
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