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

2.19K views

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

The macroscopic movement does not factor into the kinetic theory of temperature, it is the average kinetic energy from an independent frame of reference stationary to the object/liquid/gas you’re looking at. Otherwise temperature would be completely dependent on the frame of reference – any water stationary from your point of view is still moving at 30km/s from the sun’s point of view, should that mean the water is extremely hot?

You are viewing 1 out of 7 answers, click here to view all answers.