Which state of matter has a definite shape and volume?

The state of matter that has a definite shape and volume is a solid. In solids, the particles are closely packed together in a fixed arrangement, which allows them to maintain a stable shape and volume regardless of the container they are in. This structure results in strong intermolecular forces that keep the particles in place, preventing them from moving freely.

In contrast, liquids have a definite volume but take the shape of their container because their particles are close together but can slide past one another. Gases have neither a definite shape nor volume; they expand to fill the entire container and are composed of particles that are far apart and move freely. Aerosols consist of tiny liquid droplets or solid particles suspended in a gas, correlating more with the properties of gases rather than having a defined shape or volume, as they disperse in the medium in which they are found.