Question

(a) State the various factors which affect evaporation.

(b) How does evaporation cause cooling?

Answer 1

Answer:

a)Evaporation depends upon:-

 Temperature.

Surface area of the liquid exposed to the atmosphere.

Wind speed and.

Humidity.

Explanation:

b)When evaporation occurs then than the liquid (mostly water) absorbs all the heat from the surroundings and take it with it and we feel cool.

Answer 2

Ans 1 Solid carbon dioxide is known as dry ice

a)The rate of evaporation is affected by the following factors:

i. Temperature: The rate of evaporation increases with an increase in temperature.

ii. Surface area: The rate of evaporation increases with an increase in surface area.

iii. Humidity: The amount of water vapour present in the air is called humidity.

B)Answer. Evaporation causes cooling because during evaporation the particle of the liqued absord energy from the surroundings to regain the energy lost during evaporation. the absorbtion of heat from the surrounding makes the surrounding cool. Example : 1.when we spray a deo on our hand. 2.Acetone

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