Standard Science Primary 4 Energy

Siti poured the same amount of hot water at 90°C into two identical beakers wrapped in different cloths. Which setup will cool down faster?

A Setup B because white cloth is a better conductor of heat.
B Setup A because black cloth absorbs heat better.
C Setup B because white cloth absorbs heat better.
D Setup A because black cloth loses heat faster.
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Worked Solution

Step 1: The water is hotter than the surroundings, so it will lose heat. Step 2: Dark colours are better emitters (losers) of heat than light colours. Step 3: Therefore, Setup A with the black cloth will lose heat to the surroundings faster.

Correct answer: Setup A because black cloth loses heat faster.

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