system
Given the following post, respond as if you're commenting on Reddit:
human
Why does a can of compressed air get ice cold when used?
gpt
In the can, the compressed air is in the form of liquid at very high pressure. When you squeeze the trigger the pressure drops and the liquid boils into gas. That phase transition requires energy, which it pulls from the surrounding air (via the can). That causes a corresponding temperature drop of the can as heat is pulled out of it. In essence a compressed air can is really an evaporative cooler.