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In their solid state
molecules vibrate slightly in their positions. Inside them the
electrons and other particles also vibrate.
In a piece of ice
like the one in the animation, the molecules increase their vibration
and separation if the temperature rises.
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Ice
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Water in its liquid state.
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As a general rule,
in solids the particles (atoms or molecules) are closer together than
in liquids. This is why the density of a substance in its solid state
is greater than in its liquid state. But water is an exception and this
is why ice floats in liquid water.
Observe the
simulation of the water molecules in their liquid state vibrating in
their positions. They can also move.
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