Standard Science Primary 4 Matter

Ross spread out a wet cloth under a fan to dry it. Why does spreading out the cloth help it dry faster?

A It increases the amount of heat gained from the fan.
B It increases the surface area of the water exposed to air.
C It decreases the humidity of the air.
D It increases the temperature of the water.
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Worked Solution

Step 1: Evaporation occurs only at the surface of a liquid. Step [2-9]: Spreading the cloth increases the amount of water surface in contact with the air. Step [2-9]: A larger surface area increases the rate of evaporation.

Correct answer: It increases the surface area of the water exposed to air.

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