Solids are considered rigid because they are difficult to deform or change their shape, maintaining their structural integrity.
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Solids tend to maintain their shape under outside force, although they may break under excessive force.
Solids have a definite shape, distinct boundaries, fixed volume, and negligible compressibility.
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.