Standard Science Primary 5 Cycles

Tim poured 50ml of water into a wide shallow dish and another 50ml of water into a tall narrow glass. He left both near a window. Why will the water in the dish dry up faster?

A The dish absorbs more heat from the sun.
B The glass prevents wind from reaching the water.
C The glass is cooler than the dish.
D The dish has a larger exposed surface area.
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Worked Solution

Step 1: Evaporation occurs at the surface of a liquid. Step 2: A wide shallow dish exposes more water to the air compared to a narrow glass. Step 3: A larger exposed surface area allows more water molecules to escape as vapour, increasing the rate of evaporation.

Correct answer: The dish has a larger exposed surface area.

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