Question

The rate of evaporation increases as________
A. The expand surface of liquid increases
B. The expand surface of liquid decreases
C. The movement of air above the surface of liquids decreases
D. Atmospheric pressure increase

Answer 1

Hint: Evaporation is that kind of process that we observe in our day to day life. For example, when we put our wet clothes under the sun, they get heated up resulting in the evaporation of water particles present in wet clothes. We always spread out our clothes in sunlight.

Complete step by step answer:

Evaporation is a surface phenomenon. So, the rate of evaporation is directly proportional to surface area of the liquid.
From our daily life example, if we take two wet clothes and want to dry them. We put one cloth with less surface area in sunlight and another one with maximum surface that the cloth can acquire. We get to know that the cloth with less surface area takes more time to dry out then the later one with maximum surface area.
So, from this experiment we now say that the rate of evaporation increases as the expanding surface of liquid increases. So our correct option is option A.

Option B is incorrect, because it takes more time in evaporation if we decrease the expanded surface of the liquid.

Option C is incorrect, because evaporation increases with an increase in movement of air. Particles of vapour move away when the movement of air increases. This leads to a decrease in the amount of water vapour in the atmosphere. For example, we use hand dryers to dry our hands. Here the air is expelled from the hand dryer which dries our hand.

Option D is incorrect, because if air pressure is high on the surface of a body of water, then the water will not evaporate easily. The pressure pushing down on the water makes it difficult for water to escape into the atmosphere as vapour.

So, from the above discussion it is clear that the answer of this question is option A.

Note: Evaporation increases with a decrease in humidity: Humidity means the amount of vapour present in the air. There is a limit of vapour that air can only hold at a certain temperature. If the temperature increases and the wind speed and humidity stay constant, then the rate of evaporation will increase since warmer air can hold more water vapour than colder air.