What happens when water is cooled from 4° C to 0° C?
What happens when water is cooled from 4° C to 0° C?
AIts volume decreases uniformly, becoming minimum at 0°C
BIts density increases uniformly, attaining maximum value at 0°C
CIts volume decreases upto 4° C and then increases
DIts density decreases upto 4° C and then increases
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Water at ordinary temperatures contracts and increases in density as it is cooled, like most substances.
But at about 4°C it reaches a maximum density and then decreases in density as it approaches the freezing point. This decrease in density is only about one part in 10,000 as it cools from 4°C to 0°C, but this is sufficient to cause the water near freezing to come to the top. The water further expands upon freezing, so that water freezes from the top down, and ice floats on water.Reference: http://hyperphysics.phy-astr.gsu.edu/hbase/chemical/waterdens.html
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