Advanced Science Primary 4 Energy

Siti wrapped two identical beakers of hot water. Beaker X was wrapped in wool and Beaker Y was wrapped in aluminium foil. After 20 minutes, the water in Beaker X was hotter. Why?

A Aluminium foil reflects heat back into the water.
B Beaker Y gained more heat from the surroundings.
C Wool is a better conductor of heat than aluminium.
D Wool is a poorer conductor of heat and traps more air.
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Worked Solution

Step 1: Wool is a poor conductor of heat. Step 2: It traps air, which is also a poor conductor. Step 3: This slows down heat loss from the hot water to the surroundings.

Correct answer: Wool is a poorer conductor of heat and traps more air.

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