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Why do metals contract and expand?

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in Aerospace Materials & Processes by (828k points)
Why do metals contract and expand?

(a) Due to cooling and heating

(b) Due to displacement

(c) Due to repairs

(d) Due to false recognition

I have been asked this question in an interview.

The question is from Physical Terms and Test Terms in section Physical Test & Heat Treatment Terms of Aerospace Materials & Processes

1 Answer

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Best answer
Right answer is (a) Due to cooling and heating

Best explanation: The cooling and heating of metals causes contraction and expansion respectively. That is the reason why railway tracks expand in summer.

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