property of anomalous expansion of water
Answers
Explanation:
If you cool water, it follows the general trend till 4o C. Densityof water gradually increases as you cool it. When you reach 4oC, it’s density reaches a maximum. What water does next will astound you. When you cool it further to make some ice, ie 0oC, water expands with further drop in temperature meaning the density of water decreases when you cool it from 4oC to 0oC. This behaviour is charted in the graph below.
The effect of this expansion of water is that the coolest water is always present on the surface. Since water at 4oC is the heaviest, this water settles on the bottom of the water body and the lightest ie the coolest layer accumulates on the top layer. So in the winter, the top of the water is always the first to freeze over. Since ice and water both are a bad conductor of heat, this top layer of ice insulates the rest of the water body from the cold of the winter,thereby protecting all the life in the water body. Now you can truly comprehend how essential the anomalous properties of water are for life.
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