# Is it possible to compress gas without making it hotter?

sengihantq 2022-09-01 Answered
Is it possible to compress gas without making it hotter?
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## Answers (1)

Rachael Singh
Answered 2022-09-02 Author has 4 answers
Consider an ideal gas at $300\phantom{\rule{thinmathspace}{0ex}}\text{K}$ at a pressure of 1 atm. The ideal gas law gives a density of about $2×{10}^{25}$. So you'd expect that you'd be able to move the piston a distance of about $1/\lambda =5×{10}^{-22}\phantom{\rule{thinmathspace}{0ex}}\text{m}$ before it collides with a gas particle. This is an incredibly tiny distance, about ${10}^{-6}$ times the size of a proton. The upshot is that it's practically impossible for the situation you're describing to occur. As soon as you move the piston at all, it will collide with a gas particle.
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