explain with an example that evaporation causes cooling effect
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THE COOLING IS CAUSED BY EVAPORATION IS BASED ON THE FACT THAT WHEN A LIQUID EVAPORATES, IT DRAWS, OR TAKES THE LATENT HEAT OF VAPORISATION FROM ANYTHING WHICH IT TOUCHES. BY LOSING HEAT ANYRHING GETS COOLES.
EXAMPLE:
IF WE PUT A LITTLE SPIRIT AT THE BACK OF OUR HAND AND WAVE IT AROUND, THE SPIRIT EVAPORATES RAPIDLY AND OUR HANDS FEELS VERY COLD. THIS IS DUE TO THE FACT THAT TO CHANGE FROM THE LIQUID TO THE VAPOUR STATE, SPIRIT REQUIRES LATENT HEAT OF VAPORISATION. THE SPIRIT TAKES THIS HEAT OF VAPORISATION FROM OUR HAND. THE HAND LOSES HEAT AND GETA COOLED.
EXAMPLE:
IF WE PUT A LITTLE SPIRIT AT THE BACK OF OUR HAND AND WAVE IT AROUND, THE SPIRIT EVAPORATES RAPIDLY AND OUR HANDS FEELS VERY COLD. THIS IS DUE TO THE FACT THAT TO CHANGE FROM THE LIQUID TO THE VAPOUR STATE, SPIRIT REQUIRES LATENT HEAT OF VAPORISATION. THE SPIRIT TAKES THIS HEAT OF VAPORISATION FROM OUR HAND. THE HAND LOSES HEAT AND GETA COOLED.
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