When water is heated from 0^\circ C to 4^\circ C, its density
- A. remains constant.
- B. increases. ✓
- C. decreases.
- D. first increases then decreases to its original value.
Correct Answer: B. increases.
Explanation
Due to the anomalous expansion of water, it contracts when heated from 0^\circ C to 4^\circ C. Because its volume decreases, its density steadily increases and reaches its maximum exactly at 4^\circ C.
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