2007-04-23 06:26:07 · 10 answers · asked by Anthony C 1 in Science & Mathematics ➔ Physics
Because water will extract energy from the air to become vapor.
Water requires 40.68 kJ of heat to turn one mole (18g) of water into vapor.
2007-04-23 06:32:24 · answer #1 · answered by catarthur 6 · 2⤊ 1⤋
Because, to evaporate the water, the damp towel must take heat from the air passing past and through it from the fan. This cools the air coming from the fan.
2007-04-23 06:35:11 · answer #2 · answered by ? 7 · 1⤊ 0⤋
Towel Fan
2016-11-01 09:19:04 · answer #3 · answered by Anonymous · 0⤊ 0⤋
For the same reason a swamp cooler works to cool a room. By adding moisture to the air. Air passing over the damp towel, or like in a swamp cooler, a grid with water trickling over it, cools the air. Much like when you blow on your arm when it is wet, it feels cooler. This method will only work in a lower humidity environment. If the air is already at a higher humidity, this method won't be too effective.
2007-04-23 06:34:36 · answer #4 · answered by Anonymous · 0⤊ 1⤋
because the fan works by moving the air across and while the air is crossing the fan and then the damp dowel it looses some of its heat because the water on the towel uses some of the heat to make the water frume and so the air becomes cooler and colder .
2007-04-23 06:40:23 · answer #5 · answered by hero yoy 1 · 0⤊ 1⤋
The air passing through the damp towel is vaporising the water in it.
Vaporisation of water requires 80 calories per gram of Latent Heat.
This is removed from the air as it passes through the towel.
The water vapor doesn't increase in temperature.....
Ergo.. the air is cooler.
2007-04-23 06:39:57 · answer #6 · answered by Norrie 7 · 1⤊ 0⤋
This involves the same concept as with the room cooler. In order to use the air cooler we always use water to wet the grass and then use it vapor to get mixed with the air to create a feeling of cold.
2007-04-23 10:07:01 · answer #7 · answered by Napster 2 · 0⤊ 0⤋
The water requires heat energy to evaporate.
It obtains the heat energy from the air. If the heat is removed from the air, the temperature of the air decreases.
2007-04-23 06:42:35 · answer #8 · answered by Anonymous · 1⤊ 0⤋
Evaporative cooling.
2007-04-23 06:32:04 · answer #9 · answered by Mark 6 · 2⤊ 0⤋
When a liquid such as water evaporates, it cools...
2007-04-23 06:33:19 · answer #10 · answered by Anonymous · 2⤊ 1⤋