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When water is heated between 0°C and 4°C, it's density

Physics
NECO 2001

When water is heated between 0°C and 4°C, it's density

  • A. increases for a while and then decreases
  • B. decreases for a while and then increases
  • C. increases
  • D. decreases
  • E. remains constant.
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Correct Answer: Option A
Explanation

Water exhibits a unique property known as anomalous expansion between 0°C and 4°C.

When water is heated from 0°C, its density increases and reaches a maximum at approximately 4°C (precisely 3.98°C). This means the volume actually decreases slightly in this temperature range.

Beyond 4°C, the density begins to decrease as normal thermal expansion occurs, and the volume increases with further rise in temperature.

This unusual behaviour is why water is densest at 4°C.


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