Question

what is anamolous behaviour of water???

Answer 1

Anomalous expansion of water is an abnormal property of water whereby it expands instead of contracting when the temperature goes from 4°C to 0°C, and it becomes less dense. ... The density becomes less as it freezes because molecules of water normally form open crystal structures when in solid form.

Answer 2

Water shows some exceptional behavior that is when it is heated at 0°C, it contracts instead of expanding it happens till it reaches 4°C. The volume of a given amount of water is minimum 4°C therefore it's density is maximum. After 4°C the volume increases and therefore the density decreases. This means water has maximum density at 4°C