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/sci/ - Science & Math

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4650878 No.4650878 [Reply] [Original]

If temperature is defined as the average speed of a collection of molecules, why does a stiff breeze feel cool?

>> No.4650896

Because molecules.

>> No.4650926

Every still object`s molecules are moving, why would a breeze be any different.

>> No.4650933

Just google stuff.

http://en.wikipedia.org/wiki/Felt_air_temperature
http://en.wikipedia.org/wiki/Wind_chill
etc.

>> No.4650958

because air which is cooler than your skin is pushing molecules of air warmed up by your skin and replacing it with cooler ones.

>> No.4650981

I heard somewhere that the average speed of air molecules is about 3000 mph. So, a breeze is relatively "colder" than the average speed to begin with.

>>4650958
Thanks.

>> No.4650988

>>4650958

This, I was going to go the more general engineering stand point of convective heat transfer.

IT'S SUPER EFFECTIVE!

>> No.4651011

Heat isn't just all the kinetic energy of molecules. It's only the component of that kinetic energy that is at max entropy. In other words, it's only the part of the kinetic energy that comes from random jiggling of molecules. Uniform motion (like wind blowing) isn't heat.