system
Given the following post, respond as if you're commenting on Reddit:
human
Do fans increase the temperature of the air they move?

As I understand it, increasing the movement (or vibrations) of the molecules in a gas increases the temperature of a gas.

Would the propulsive action of a fan on the air moving through it have any kind of effect on the actual temperature of the air as it leaves?
gpt
Yes, but the effect is so slight that it would be almost impossible to measure. A fan is basically a high flow low pressure compressor. It works by slightly increasing the pressure on the surface of the blade. And from the ideal gas law, PV=nRT, temperature is directly related to pressure. Since the pressure change is low and the volume is very high, the temperature change is very low.