| Solids |
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A solid has a definite shape and size, because its particles are tightly packed together.
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| Liquids |
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A liquid has a definite size, but not a definite shape. The particles take on the shape of the container and are not so tightly packed.
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| Gases |
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A gas does not have a definite shape nor a definite size. The particles take up as much space as is available to them and are loosely packed.
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