Question

what do you mean by Anomalous expansion of water? ​

Answer 1

Answer:

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

Answer 2

Answer:

On heating a liquid starts expanding, but on heating water upto 4 degree Celsius water starts to contract instead of expansion. This behaviour of water is called anomalous behaviour of water.