The maximum density of water is at:
Correct answer: C. 4 ˚C
- A. 2.98˚C
- B. 3.98 ˚C
- C. 4 ˚C
- D. 4.98 ˚C
Explanation
The maximum density of water is at 4°C as there are two opposite effects that are in balance. The density of ice is less than liquid water, so it floats. Upon freezing, the ice density decreases by about 9%.
This question appeared on the NUMS 2021 paper, which you can sit online with every answer explained.
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About Anomalous Behaviour of Water
Water expands when cooled below 4°C and when it freezes, giving liquid water its maximum density at 4°C. The explanation depends on hydrogen bonding and the open structure of ice, which makes ice less dense than water and allows it to float.
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