Why does the hot air in the room become fresh when moved by the fan?

because the blades of the fan slice the bad air molecules which cleans it up.

>>8240931
something something evaporative cooling something something

it's hot, you sweat, the air takes up the liquid from your skin, it cools you down

it takes energy to convert liquid to gas (heat capacity for phase transition), so when liquid sweat is carried away from you as vapor you're giving up energy and feel cooler.

The fan increases the rate at which sweat is evaporated.

So the air is as hot as before passing through the fan?

>>8240950
>the air is as hot as before
fuck i don't even know anymore

Someone more intelligent/educated than I needs to step in and give a clear definition of the 'system' and the 'surroundings'.

>>8240950
Yes, if not hotter

>>8240964
/thread

>>8240931
Because air molecules in contact with your skin become hotter. The fan constantly pushes new, cooler molecules and kicks out the old, hot ones.

>>8240931
It doesnt. It becomes hotter. Moving air is just better at taking away heat from your body. Everybody who leaves a fan turned on in a room, where nobody is, should kill himself now.

File: ROlnz8t.jpg (84KB, 1024x683px) Image search: [Google]

84KB, 1024x683px

>>8240995
Brb

Then why do fans get computers cool?

>willingly risking fan death

Fans push air particles around spreading them out and lowering pressure and tempature. Without something to push the particles apart they settle closer and closer together making the air in a room feel "stale".

>>8241153
because they take the hot air from the cpu and push it away. That's why if your room is hot your CPU may overheat

>>8240962
Than "me". You arent the object of the sentence.