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Sates of matter
Changes of state: mass and volume
1) 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.
We can generalize:
A state change always causes a change in volume.
Comment:
Water is an exception, volume increases during a melting for most of substances.
2) 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.
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