The states of matter that have a definite volume are solids and liquids.
**Solids** have a fixed shape and volume. The particles in a solid are tightly packed together in a regular pattern, which means they cannot move around freely. This tight packing gives solids their definite shape and volume.
**Liquids** also have a definite volume but not a definite shape. The particles in a liquid are close together but not as tightly packed as in a solid. This allows the particles to move around more freely, which is why liquids can take the shape of their container. However, the volume of a liquid remains constant because the particles are still close enough to maintain a fixed volume.
In contrast, **gases** do not have a definite volume. The particles in a gas are far apart and move freely, allowing gases to expand and fill the entire volume of their container.