(a) it is said that evaporation causes cooling, why? (b) explain how rate of evaporation of an aqueous solution decreases with incrase in humidity of surrounding air. (c) why do we see water droplets on the outer surface of glass containing ice cold water?
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(A) Whenever a substance gets evaporated , it takes the heat energy from the surroundings, thus cooling it.
(B) Humidity is the amount of water vapor in the air. Increase in humidity leads to an increase in the amount of water vapor in the air. This leaves behind no space for the substance to get evaporated. Hence rate of evaporation decreases.
(C)The water vapor in the air condenses when it comes in contact with the cold surface of the glass containing cold water. As a result, dew appears on the surface.
(B) Humidity is the amount of water vapor in the air. Increase in humidity leads to an increase in the amount of water vapor in the air. This leaves behind no space for the substance to get evaporated. Hence rate of evaporation decreases.
(C)The water vapor in the air condenses when it comes in contact with the cold surface of the glass containing cold water. As a result, dew appears on the surface.
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