Question

volume of water on freezing ? increase or decrease??

Answer 1

in general, a given volumeof liquid water at room temperature will increase in volume by about 9.05% after freezing. Most materials do the opposite, that is, the solid form of most substances is more dense than their liquid form.

Answer 2

When the water freeze it change into ice . When Water change into Ice , its volume decrease with 9.05% .

Fact On water and Ice .
We see generally only the tip of Iceberg is visible ?
because the density of ice is slightly more than the water . Therefore , only the tip of Iceberg is visible and rest part of Iceberg is inside the water.