Standard Science Primary 5 Cycles

Siti wants her wet hair to dry as fast as possible after a shower. Which combination of actions will provide the fastest rate of evaporation?

A Wrap her hair in a towel and stand in the sun.
B Use a warm hairdryer and brush her hair out.
C Use a cold towel and sit in a closed room.
D Tie her wet hair into a bun and sit under a fan.
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Worked Solution

Step 1: Evaporation rate increases with higher temperature, stronger wind, and larger exposed surface area. Step 2: A warm hairdryer provides heat (temperature) and moving air (wind). Step 3: Brushing the hair out increases the exposed surface area. Step 4: This combination maximizes all three factors for evaporation.

Correct answer: Use a warm hairdryer and brush her hair out.

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