I believe compressed air should be colder. Like when you have an air duster can. Or even a car’s turbocharger which compressed air and cools it right? But also, when there is pressure on air parcels doesnt that pressure increase its heat? At the bottom of a valley, the atmospheric pressure is higher so the air that falls to the bottom of the valley is more compressed and hot. It seems to me like compressed air is both hot and cold then? Could someone explain please? 😅
In: Physics
Part of your understanding issue is a problem of scale.
A can of compressed air has 47 psi (on average)
Air at sea level is 14.7 psi.
Air at one mile above sea level is 12 psi.
Air pressure doesn’t really change enough to impact temperature moving from a valley to a hill. That’s mostly wind and sun exposure that does that.
Canned air gets cold because of the energy of its heat. Inside the can it’s not any colder then the room it’s in. But as it’s sprayed that air expands quickly and fills up a big space. The heat energy that makes the can room temperature is now spread out over a huge area. Temperature is a measure of energy / area. Increase the area and temperature goes down.
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