Advanced Science Primary 4 Energy

An iron bridge is built with small gaps between the metal sections. What is the purpose of these gaps?

A To allow rainwater to flow through.
B To allow the bridge to lose heat faster.
C To make the bridge lighter.
D To provide space for the metal to expand on a hot day.
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Worked Solution

Step 1: Metals expand when they gain heat from the sun. Step 2: Without gaps, the expanding metal would push against each other and buckle or damage the bridge. Step 3: Gaps provide the necessary space for this expansion.

Correct answer: To provide space for the metal to expand on a hot day.

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