Discussion
Density of water is maximum at :
Answer: C
Water is densest at 4°C.
More exactly, pure water reaches its maximum density of about 1000 kg per cubic metre at 3.98°C. Above that, it expands on warming as any liquid does. Below it, hydrogen bonding starts to build an open, ice-like structure, so the water expands as it cools to 0°C, and ice is less dense still.
This anomaly matters ecologically: in winter, water at 4°C sinks to the bottom of a lake while colder water and ice stay on top, so lakes freeze from the surface down and aquatic life survives below. 0°C, 5°C and 10°C are all less dense than water at 4°C.
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