system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does the a/c setting in your car defog the windshield better than normal air?
gpt
Because passing air through the evaporator core of the a/c system removes humidity from the air. Dry air defogs much better than moist air. Lots of cars actually activate the a/c as part of the defrost setting automatically.