Solids have a defined shape and volume, liquids have a fixed volume but not a fixed shape, and gases expand to fill their containers.
Solid
A solid has definite volume and shape, a liquid has a definite volume but no definite shape, and a gas has neither a definite volume nor shape. For example, a pebble is a solid with both shape and volume, while a breathing mixture in a scuba tank is a gas with no definite volume or shape.
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