In science I was always told particles moving causes heat. So why does a fan cool you down?
Answers:
Latent heat of vapourisation..
the sweat evaporating from your body takes heat energy from the surface of your skin to break the bonds. The fan just accelerates the process.
because cold hair, containing slower moving particles is blown to replace hot air - faster moving particles. What do you want from me?
Because a) there's not enough friction in the air to generate heat - the molecules simply don't come into sufficient contact and b) the molecules touch your skin, pick up the heat and carry it away
That's the short answer
This is related to water eveporation.. when fan s switched on & u r sweating. the water from your body starts evaporating quickly due to air factor & hence your skin temperature drops making u feel cooler...
If your room is air tight & you leave the Fan On for whole night. your room will get hotter then it was earlier..
evaporation - when the sweat evaporates from your skin it pulls heat out of your body. (that's also why putting rubbing alcohol on your skin feels cool because alcohol evaporates very quickly)
A fan does not actually cool you down, it just creates the impression of cond air.
Moving air that is colder then approx. 45°C feels cool when passing your skin.
because air has little friction in it.
As Mickey D said the cooler air with slower moving particles passes through the fan.
If you leave the fan on long enough in enclosed room or areas the heat generated by the fans electric motor warms up the air in the room and becomes less or non effective.
Wrong, a fan runnuning in a closerd room during winter seems to yield warmer feeling than in a closed room without fan. Am I wrong?
Only Particle being squeezed and smaller hole causes heat, the practicals are brought in from the back and separated but the constant movement of the fan, therefor cooling the air around you, if that was the case of moving particles = heat, why is the wind not warm or even hot in hurricanes, etc?
Actually, friction causes heat when two or more particles rub together. A fan moves air in one direction whereby all the particles are moving uniformly in a single direction with no friction. Consequently, no friction, no heat.
fan rotates the air around in a faster speed. hence, we feel comfortable. but due to it's spinning, it's motor would have got heated up.
Moving air over a surface will disapate heat more quickly from that surface, check Thermodynamics on Wickipedia.
Evaporation is a factor as some have said, but not the only one. Otherwise how would the air-cooling of old VW engines, or your computers CPU fan work? There's no water to evaporate from a hot cylinder head or your CPU! (Yes, I know some PCs now have liquid cooling, but it works under the same principle.)
The process is heat exchange and, in the case of exposed skin, evaporation.
the electric makes it go faster. dah!
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