Explain the Anomalous expansion of water .
Mention it clearly when water contracts, expands when we heat and cool down
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Answers
Answer!!
If we take some water at 0°C and start heating it, we find that it contracts (instead of expanding) in the temperature range from 0°C to 4°C. On heating it further above 4°C, it expands. Similarly, if water initially at a temperature above 4°C is cooled, it contracts till the temperature of water reaches 4°C. On further cooling it below 4°C to 0°C, it expands. This unusual expansion of water on cooling it in the temperature range 4°C to 0°C, is called anomalous expansion of water.
Thus, the expansion of water when it is cooled from 4°C to 0°C, is known as anomalous expansion of water.
The volume of water first decreases on heating it from 0°C to 4°C and then increases on further heating it from 4°C to 10°C. The volume of water is minimum at 4°C.
When water is heated from 0°C, the density of water first increases from 0°C to 4°C and then decreases above 4°C to 10°C. On the other hand, on cooling water from 10°C, the density of water first increases up to 4°C and then decreases when it is cooled further below 4°C to 0°C. Thus, the density of water is maximum at 4°C.
Anomalous expansion of water :-
Water has a unique property of anomalous expansion. When water is cooled from room temperature it first contracts in volume and becomes increasingly dense as do other liquids, but at 4° C water reaches its maximum density. On further cooling it starts expanding and become less dense.
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