Standard Science Primary 5 Cycles

Alexa wants to dry a puddle of water on the floor quickly. She turns on a fan and opens the window to let the sun in. How do these actions speed up evaporation?

A The fan lowers the temperature and the sun increases the surface area.
B Both the fan and the sun increase the exposed surface area.
C The fan provides heat energy, and the sun increases the wind.
D The fan increases the wind, and the sun provides heat energy.
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Worked Solution

Step 1: Identify the factors affecting the rate of evaporation. Step 2: The fan creates wind (moving air), which removes water vapour near the surface, speeding up evaporation. Step 3: The sun provides heat energy, raising the temperature, which also speeds up evaporation.

Correct answer: The fan increases the wind, and the sun provides heat energy.

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