Answer / subbu

Water shows unusual expansion. If we take a cube of ice at -5°C and heat it, it expands till ice starts melting. During melting its temperature remains 0°C but its volume decreases. If heat is continuously supplied to water at 0°C, it further contracts up to 4°C and then it starts expanding. Thus water has its minimum volume and maximum density at 4°C.

The anomalous expansion of water helps preserve aquatic life during very cold weather. When temperature falls, the top layer of water in a pond contracts, becomes denser and sinks to the bottom. A circulation is thus set up until the entire water in the pond reaches its maximum density at 4°C. If the temperature falls further, the top layer expands and remains on the top till it freezes. Thus even though the upper layer are frozen the water near the bottom is at 4°C and the fishes etc. can survive in it easily.

Answer / mayank jansari

at that temp water just start cooling and
m=density* volume
so density of water=mass of water/volume of ice

Answer / s.muthupandi

at this temperature voulume of the water decreases we know
density=mass\volume so that at 4*c water density is high

Answer / vishram kulkarni

i have not have cleared the question

Answer / raj.48000

it is due to the cage like structure of water.

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