Which state of matter has a definite shape and volume?

The state of matter that possesses a definite shape and volume is solids. In solids, the molecules are tightly packed together and can only vibrate in place, which gives them both a fixed shape and fixed volume. This structure allows solids to maintain their form, regardless of the container they are placed in.

In contrast, liquids have a definite volume but take the shape of their containers, while gases have neither a definite shape nor a definite volume, expanding to fill any available space. Plasma, which is often found in stars, consists of highly energized, ionized particles and exhibits properties different from solids, liquids, and gases. Therefore, solids are clearly the state of matter characterized by having both a specific shape and volume.