Standard Science Primary 4 Energy

Why are small gaps left between the concrete slabs of a pavement?

A To allow for expansion on hot days.
B To make the pavement look better.
C To save materials during construction.
D To let water drain away faster.
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Worked Solution

Step 1: Concrete is a solid that gains heat from the sun. Step [2-9]: Heat gain causes solids to expand. Step [2-9]: Gaps prevent the slabs from pushing against each other and cracking.

Correct answer: To allow for expansion on hot days.

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