Standard Science Primary 5 Cycles

Jun Jie hung two identical wet towels, X and Y, out to dry. He folded towel X in half but spread towel Y out fully. Which towel dried faster and why?

A Both dried at the same rate because they were identical towels.
B Towel X dried faster because folding it trapped heat.
C Towel Y dried faster because it had a larger exposed surface area.
D Towel X dried faster because it had less exposed surface area.
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Worked Solution

Step 1: Identify the process: Drying is caused by evaporation. Step 2: Recall factors affecting evaporation: A larger exposed surface area increases the rate of evaporation. Step 3: Spreading towel Y out fully gives it a larger exposed surface area than folded towel X.

Correct answer: Towel Y dried faster because it had a larger exposed surface area.

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