A solid is a state of matter in which the atoms are closely packed together and held in place by strong interatomic forces. Solids have a definite shape and volume, and they are much harder to compress than liquids or gases. The vast majority of known materials are solids.
The three most common states of matter are solids, liquids, and gases. Of these, solids are the densest; their molecules (or atoms) are closest together on average. This means that solid substances generally have the highest melting points and boiling points of all three phases—they require more heat energy to break apart than either liquids or gases do. It also follows that a given substance will expand less when heated if it is already in the solid phase rather than either liquid or gas.
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