Moving air thrown by electric or hand fam seems cooler, even though there is no change in temperature.
2006-07-31 07:22:56 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Weather
On a hot day where you are perspiring, the mass transfer of water to the air is greater, and this cools your skin by releasing the latent heat of vaporization of the water.
On a cold day, the moving air blows the layer of just-warmed air away from your skin and keeps fresh cold air in contact with it. This increases the average temperature differential between your skin and the air, and causes you to chill more quickly. This effect on the macroscopic level is called convection, and is the same mechanism used by a convection oven to cook food more quickly than a radiant bake oven.
2006-07-31 07:31:59 · answer #1 · answered by Steve W 3 · 2⤊ 0⤋
Your body is touching air. Your body has heat, and because of the contact with the air, the heat gets stolen by air. This is when it is cooler than your body. When it is hotter than your body you sweat to let the sweat evaporate and take away heat. The more air your body touches (if the air is ooler than you body) the more heat is lost. The air molecules by your body take heat from the body till they are the same temp (diffusion) and they give that heat to the ones by them, etc so they never get enough. When wind (from fans etc) touches you, more molecules are hitting you, so more heat can be taken. This is why you have wind chill etc. When the air is hotter than the body, you get heat from it, and it works in reverse. Sweating is the only way you can beat that. I have been in 130 degree temps, and had the windows open on the car at 60 mph, and the wind felt hot as fire. The reason you sweat in temps cooler than you body is explained in my last answer
"Our bodies hold and produce heat. The air takes the heat away. When it gets to say 90 degrees for example. The air can not take away enough heat quick enough. So we get hotter. We sweat to cool off. The sweat (water) holds heat, and takes it with it when it evaporates from the body. The humidity will determine how fast the sweat evaporates. The more water in the air, the slower the sweat evaporates, so the sweat stays longer, and you sweat more. Humidity makes you hotter, but your body does not want it at the same temp. Our bodies maintain temp with sweat, and calories burned. Our bodies are built to stay that hot, and the air takes the heat away, so we produce enough to compensate for that. When you take that away, the body keeps making heat, because it needs to burn calories, and that makes heat. Your body is counting on cool dry temp. When that is not there, you get hot and sweat to adapt. "
2006-07-31 07:38:14 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Moving air aids in the evaporation of sweat on the skin, so it feels cooler.
2006-07-31 07:26:37 · answer #3 · answered by Joe Rockhead 5 · 0⤊ 0⤋
the moving air evaporates the perspiration on you making you feel cooler.
2006-07-31 07:25:56 · answer #4 · answered by grooveface 3 · 0⤊ 0⤋
The air is evaporating perspiration from your skin which cools you a bit
2006-07-31 07:26:21 · answer #5 · answered by odu83 7 · 0⤊ 0⤋
Evaporation?
2006-07-31 07:25:48 · answer #6 · answered by Anonymous · 0⤊ 0⤋
There's actually a tiny change in temperate in air that moves. That's what you're feeling.
2006-07-31 07:26:10 · answer #7 · answered by Private Account 5 · 0⤊ 0⤋
because expanding air cools but when it condenses its warmer. Like when you blow air into your hands its warm, if you blow it and put your hand a little further away its cooler cuz its expanding.
2006-07-31 07:27:18 · answer #8 · answered by davedue22 2 · 0⤊ 0⤋
Evaporation and the fact your body produces heat and you convect.
2006-07-31 07:26:32 · answer #9 · answered by Karrien Sim Peters 5 · 0⤊ 0⤋
Heat transfer...the more humid air that hits your skin, the more heat you transfer/lose.
2006-07-31 07:27:37 · answer #10 · answered by X 2 · 0⤊ 0⤋