2006-06-21 05:44:50 · 7 answers · asked by smiley 1 in Science & Mathematics ➔ Physics
It takes energy to evaporate. When a liquid reaches the evaporation point, an amount of the liquid starts to turn to a gas, to complete this transformation in state, it absorbs energy from the surrounding liquid which cools it.
Your Air Conditioner works on the same principle. In your attic is a coil where high pressure refridgerant is suddenly exposed to a low pressure zone inside the coil of your air conditioner. When it meets this low pressure zone, it evaporates from a liquid to a gas. Again, to make this state change, it absorbs energy from anything around it, in this case the air flowing over the coils provides that energy.
The gas then is pushed through the system out to your outside unit where the excess heat it absorbed is vented off and the gas is compressed back into a liquid.
2006-06-21 05:47:10 · answer #1 · answered by Databit42 4 · 1⤊ 0⤋
The thermal motion of a molecule of liquid must be sufficient to overcome the surface tension and evaporate, that is, its kinetic energy must exceed the work function of cohesion at the surface. Evaporation therefore, proceeds more quickly at higher temperature, at higher flow rates between the gaseous and liquid phase and in liquids with lower surface tension (i.e. higher vapor pressure). Since only a small proportion of the molecules are located near the surface and are moving in the proper direction to escape at any given instant, the rate of evaporation is limited. Also, as the faster-moving molecules escape, the remaining molecules have lower average kinetic energy, and the temperature of the liquid thus decreases. This phenomenon is also called evaporative cooling. One example for evaporative cooling is sweating.
2006-06-21 05:51:48 · answer #2 · answered by natureboyharold 2 · 0⤊ 0⤋
evaporation takes energy away from the object while the liquid is evaporating. it's an exothermic process.
2006-06-21 05:47:58 · answer #3 · answered by RxGirl704 3 · 0⤊ 0⤋
it takes a lot of heat to change a liquid to a vapor. When the liquid vaporizes, it takes that heat with it cooling the remaining liquid.
2006-06-21 05:48:58 · answer #4 · answered by Anonymous · 0⤊ 0⤋
the process of going from a liquid to a gas takes energy. that energy has to come from somewhere so it takes head from the liquid
2006-06-21 05:48:00 · answer #5 · answered by shiara_blade 6 · 0⤊ 0⤋
it does not. when water outside is evaporating it's because the sun is beating down on it and its actually heating up.
2006-06-21 05:48:48 · answer #6 · answered by Brilliant Platypus 2 · 0⤊ 0⤋
Calorimetry.
2006-06-21 05:47:59 · answer #7 · answered by J.D. 6 · 0⤊ 0⤋