Explain the Consequences of Anomalous expansion of water...
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ANOMALOUS EXPANSION OF WATER :-
☆ It is an unique property of water. 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. This will be continued till the temperature reaches 00C, the point at which it freezes into ice.
》The water at the surface, in contact with the cold atmosphere, loses heat and its temperature decreases. It becomes denser, sinks and is replaced by less dense water from the bottom. This process repeats itself so that the overall temperature of the water decreases.
CONSEQUENCES: -
》This unusual property of water enables marine life to exist in the polar region where temperature falls below freezing temperature.
》The outer layer of water becomes ice and floats over the water. As the water has highest density at 40C sinks down and keeps its aquatic life in safest position.
》when the temperature reaches 4oC, the water remains at the surface of the lake,sea or river. This is because as temperature decreases from 4oC to 0oC, water expands. The water is still less dense and thus remains at the surface. Only a small layer of water at the surface thus becomes frozen. Ice itself is less dense than water.
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Answer:
Because of the anomalous expansion of water, when the temperature reaches 4⁰C, the water remains at the surface of the lake, sea or river. This is because as temperature decreases from 4⁰C to 0⁰ C, water expands. The water is still less dense and thus remains at the surface. Only a small layer of water at the surface thus becomes frozen. Ice itself is less dense than water.
Explanation: