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Expansion and contraction
Lower Sec Science · Secondary 2 · Medium · Expansion and contraction
On a very hot day, a steel bridge expands and presses against its ends. Which statement best explains why this happens?
- Steel expands when heated, so its length increases and it pushes against its ends.
- Steel contracts when heated, pulling the ends closer together.
- Steel melts immediately when heated, causing it to sag.
- Steel does not change size; only the air around it expands.
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