Volume of water and change of state
If the the
level of water in a container is compared before and after the fusion,
it can be realized that the ice has a higher level than that of liquid
water: solid and liquid water does not have the same volume.
A state change always causes a change in volume.
Water is an exception, volume increases during a melting for most of
Mass of water and change of state
If the mass
of water is compared before and after a melting, the same value is
measured: liquid water at the same mass as solid water.
This result can be generalized:
During a change of state the mass remains the same.