Solids have a definite shape, distinct boundaries, fixed volume, and negligible compressibility.
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Gases have neither a definite shape nor volume, as they expand to fill the entire container. Their particles are far apart and have weak intermolecular forces.
Liquids have a definite volume but take the shape of their container. Their particles are loosely packed and have moderate intermolecular forces.
Solids have a definite shape and volume, with particles closely packed and having strong intermolecular forces.
The variation in the characteristics of particles of matter leads to the existence of different states.