Regarding water’s unusual expansion behaviour near freezing, which statement is correct?

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1. Regarding water’s unusual expansion behaviour near freezing, which statement is correct?

Water actually contracts, not expands, as it warms from 0°C up to about 4°C

Mercury thermometers work by a change in mass, not expansion

A small gap is deliberately left between railway rails to allow for thermal expansion

A metallic wire’s length increases as its temperature rises

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Water shows an anomalous pattern: instead of expanding uniformly as it warms, it actually contracts between 0°C and about 4°C, before expanding normally above that point.