Advanced Science Primary 5 Cycles

Tim wants his wet towel to dry as quickly as possible. Which combination of conditions will result in the fastest rate of evaporation?

A Folded towel, placed in a dark and windy room.
B Spread out towel, placed under the sun with no wind.
C Folded towel, placed under the sun in a windy place.
D Spread out towel, placed under the sun in a windy place.
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Worked Solution

Step 1: Rate of evaporation increases with larger exposed surface area (spread out). Step 2: It increases with higher temperature (under the sun). Step 3: It increases with the presence of wind. Therefore, all three conditions must be maximized.

Correct answer: Spread out towel, placed under the sun in a windy place.

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