/sci/ - Science & Math

>air is hot because it has more energy
>humans feel this energy as temperature for whatever reason, it doesn't matter
>first law of thermo says that all you need to do to heat up gas is to do some kind of work on it
>unfortunately, second law says hot air can't do work on its own, you need a colder reservoir
>heat pumps/refrigerators do work (expand and compress) a special fluid in a cycle to absorb heat in the region you want to cool, and to release it into the hot reservoir
tl;dr: there's no such thing as cold and the second law of thermodynamics says that you NEED two reservoirs to cool something. this isn't true for heating.
>>11629183
no lmao

>>11599376
Did you have a question?
>>11599884
This requires context
>>11599947
[math] 2700\approx2898 [/math] so maximum spectral emission occurs at ~1 micrometer. This is infrared light. But because of the shape of the Boltzmann distribution, something like ~25% of power emitted is at smaller wavelengths (so visible light including blue) (table 12.2 in Bergman).