We've already discussed how molecules in samples of matter are in constant motion. However, some move slower than others, and particle speeds mean that we get these nifty things called phases. A phase is a physical change that matter goes though and can be solid -> liquid (melting), liquid -> solid (freezing), liquid -> gas (evaporation), or solid -> gas (sublimation.) Matter also has density. Depending on its phase, a sample can have a different density. For example, as I've already briefly touched on, ice is a phase of water and it is more dense than liquid water. Snow is less dense than water, even though it's frozen, because it has smaller pieces and you'd need more of it to equal the volume or density of its solid/liquid counterparts.
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Good easy description of phases
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