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.
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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.
The three states of matter are solid, liquid, and gas.