ordinary electric fan increases the kinetic energy of the air molecules caused by fan blades pushing them means the air temperature increases slightly rather than cool the air?why use it
Answers
They don't really air-condition the gym, particularly not in the summer when the college is on break, so the primary way of cooling off is a bunch of fans scattered around to create a breeze. This reminded me of a physics question that sometimes comes up, which I thought would be an amusing quick post, namely: Does stirring air around with a fan raise the temperature?
This gets asked because, the temperature of a gas is, somewhat loosely speaking, a measure of the average speed of the atoms and molecules in that gas. A fan, though, is taking still air and putting it into motion, so you might reasonably wonder whether it's increasing the temperature by increasing that average speed.
So, how big a change would it make? Well, if we want to know that, we first need to know how fast the air molecules are moving without the fan. The actual physical relationship that comes into play is that the temperature is related to the average kinetic energy of the sample:
thermal_speed_1
Answer:
Explanation:
They don't really air-condition the gym, particularly not in the summer when the college is on break, so the primary way of cooling off is a bunch of fans scattered around to create a breeze. This reminded me of a physics question that sometimes comes up, which I thought would be an amusing quick post, namely: Does stirring air around with a fan raise the temperature?
This gets asked because, the temperature of a gas is, somewhat loosely speaking, a measure of the average speed of the atoms and molecules in that gas. A fan, though, is taking still air and putting it into motion, so you might reasonably wonder whether it's increasing the temperature by increasing that average speed.
So, how big a change would it make? Well, if we want to know that, we first need to know how fast the air molecules are moving without the fan. The actual physical relationship that comes into play is that the temperature is related to the average kinetic energy of the sample: