system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why is there “cold air” that emits from someone who just came from outside?

I’m currently sitting in a chalet at a snowboard/ski park and, although there is no door near by (sitting on upper level), people who have just been outside seconds earlier emit a really chilly breeze when they walk by vs. people who have been sitting in the chalet for a while. How does this work?
gpt
This is due to how heat transfer operates. Heat tends to move from places where it is hot to places where it is cold in order to equalize the temperature. Now technically there is no such thing as cold but rather it is an absence of heat, so that "cold breeze" you feel is actually them stealing your heat not them blowing cold on you. Their clothing is very cold from being outside in the low temperature so when they come inside their clothes remain cold until warmed by their surroundings. You happen to be the warm surroundings that the clothing absorbs as they walk by.