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Expansion and contraction
Lower Sec Science · Secondary 2 · Medium · Expansion and contraction
A metal rod is fixed between two concrete walls. It is installed on a hot afternoon. At night, the temperature drops. What is most likely to happen to the rod?
- It expands and may bend upwards.
- It contracts and may pull away slightly from the walls.
- It stays exactly the same length.
- It melts and flows downwards.
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