In liquids, the particles are still pretty close together but not necessarily touching each other. There is no pattern. We say that they arranged randomly. They are moving about in all directions, changing places all of the time.
in solids, the particles are arranged in a regular pattern, touching each other.
They attract each other with a strong force (because they are so small and so close). This means that they cannot change places.
In gases, the particles are very spread out. They are moving very quickly in different directions. They are not arranged in any pattern. They are changing places all of the time.
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