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Which of the following does not affect the rate of evaporation?
A. Pressure on evaporating substance
B. Exposed surface area of the evaporating substance
C. Shape of the evaporating substance
D. Temperature

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Last updated date: 19th Jun 2024
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Answer
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Hint: If sufficient heat energy is absorbed by molecules of some liquid present near the surface, they will cross the vapor pressure barrier and change into a gaseous state. Evaporation is the primary pathway that as atmospheric water vapor, water moves from the liquid state back into the water cycle.

Complete solution:
1.Evaporation is a process in which a liquid's certain molecules, which have greater kinetic energy, escape and enter the atmosphere from the liquid.
2.If the pressure is higher, the molecules need more energy to overcome the pressure and with increasing pressure, evaporation decreases.
3.More molecules get a chance to escape because of more surface area, so evaporation is faster.
4.Evaporation is a type of vaporization that occurs on the surface of the liquid when it changes from its liquid state to its gaseous state.
5.But the shape of the surface of the liquid does not affect evaporation. The gas surrounding the liquid should not be saturated with the evaporating material for this to occur.
6.When liquid molecules collide with each other, depending on how they collide with each other, they transfer energy from one to the next.
8.If it absorbs energy enough to overcome the vapour pressure, any molecule will enter the gas phase and escape. Molecules have greater kinetic energy at a higher temperature, so the liquid can easily escape.

Hence, the correct option is (C).

Note:
Evaporation is an important step in the water cycle of the earth, along with condensation and precipitation. $90\%$ is due to evaporation of the moisture present in the earth's atmosphere, while the remaining $10\%$ is due to transpiration. Since $70\%$ of the earth's surface is covered by oceans, they are the primary source of atmospheric water and it is important for freshwater production to evaporate this ocean water.