Question

What happens to water when it changes to ice?

Answer 1

Answer:

Its density decreases.

Its volume increases.

Explanation:

There are two changes that happen:

Its density decreases.

Its volume increases.

When the density is less, this is why ice floats on water. Density is calculate by mass/volume. Now mass is same here as we have not added anything here, this means that volume must have changed. Hence, the volume increases that makes the ice less dense.  

Answer 2

Density decreases that's why ice floats on water because it's less dense than water.