Lesson: Chapter 9 — Heat

9.4. Thermal expansion 2 of 5 Reset answers

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Question 2

Why is a small gap left between railway rails?

A To make a sound B To save steel C To drain rainwater D So the rails can expand in the heat without buckling

The right answer is the one marked above.

So the rails can expand in the heat without buckling. Without the gap, expanding rails would push into each other.

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