Solid
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Simple English Wiktionary has a dictionary definition (word meaning) for:
Solid is one of the four common states of matter. The molecules in solid matter can not move easily, so the shape of solid things will only change by force.
A solid has definite shape and volume. Solids will only keep a new shape if a strong enough force is used. For smaller forces solids are elastic.
When a solid becomes a liquid, this is called melting. Liquids become solid by freezing.
Some materials, like dry ice, can turn into gas without turning liquid first. This is called sublimation.
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