Question

At which heat the water density is highest​

Answer 1

Water is an exception from other liquids. Generally liquids expand on heating but water contracts on heating from 0° C to 4° C. This special property of water is called anomalous expansion of water.

Water contracts from 0°C to 4°C and thereafter it expands.

Therefore water contracts maximum at 4°C i.e water has least volume at 4°C.

We know density = mass/volume

At 4°C water has least volume. So the density of water is maximum at 4°C.

Answer 2

Water has its maximum density of 1 ${g/cm^3}$ at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less then 1 ${g/cm^3}$. Water has the maximum density of 1 ${g/cm^3}$ only when it is pure water.

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