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Answer» It is 4°C.
Density is inversely proportionate to Volume.
With DECREASING temperature, up to 4 degree CELCIUS, the volume of a particular amount of water shrinks and the speed of molecular movements decreases. So, the density increases gradually.
At 4 degree celcius the density becomes maximum while it is in liquid STATE.
Below 4 degree Celcius, water molecules start occupying crystal structure and while reaching solid state, the distance among one ANOTHER increases than previous. Hence with further decrease in temperature below 4 degree Celcius, the volume slightly increases and the density decreases.
One example is:
In countries FALLING under sub-polar and polar circles, water pipes often crack as water becomes ice in cold temperature. It means ice has more volume than its equivalent amount of water.
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