If molecules heat up the faster they move causing friction why is it when it's windy or the fan is on the wind

Question

emitted is cold rather than warm or hot?

Answer 1

It's friction that causes the heat (not the other way around). Objects or molecules coming into physical contact with each other create friction and generate energy in the form of heat. But the example of wind and moving air doesn't really generate the kind of friction that would produce enough heat to increase the temperature of a mass of air because the molecules of air are too far apart (low density) to cause enough friction to create a macro (overall) increase in temperature. Any frictional heat generated would be minimal and would quickly dissipate.

For example, flowing water (or air) really fast through a vessel, like a firehose, doesn't make the water any warmer. The bottom line is that frictional forces in liquids and gases caused by motion are not enough to noticably raise the overall temperature.

The reason you feel cool when wind blows on you is because the moving air is continuously drawing the heat away from the surface of your face/body, making you feel cooler.

Answer 2

The movement of air across a surface causes the removal of heat from the surface moved across. The degree of compression from a fan is extremely low, and is quickly disapated. The heat gain from movement induced by a fan is also infinitesimal, so that can be discounted as well. As long as the air temperature is below that of your body, you will loose heat to the air. If your body is moist from perspiration, then the air will feel even cooler, as the induced heat-loss is even faster, due to evaporative cooling.

Answer 3

air is cooler than your body and wind will increase the rate of heat exchange from your body to air, the friction in this case is neglectable

although at very very high speeds, like a space craft or comet entering the atmosphere, friction is a factor and heats and/or burns the object

Answer 4

You have never lived in Arizona, have you?