If temperature is related to average kinetic energy or speed of the particles, why is fast flowing water not hot?

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Is it because the velocity of one water molecule relative to the other water molecules is low? When I stick my hand into a cold stream, why do I feel that it’s cold even though the water is moving fast into my hand? Shouldn’t the water flowing fast mean more collisions with my hand (which I thought is how we sensed temperature)?

In: Physics

7 Answers

Anonymous 0 Comments

What we consider “fast” flowing water is not actually “fast”. The molecules are moving around at the about the speed of sound, so for the water to “feel fast” it would have to be moving at around that speed. If you stick your hand in water moving at the speed of sound, you will have other problems though.

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