Which type of matter is characterized by having a definite shape and volume?

A solid is characterized by having a definite shape and volume because the particles within a solid are closely packed together in a fixed arrangement. This close packing allows solids to maintain their shape and resist changes to their volume, unlike liquids and gases. In liquids, particles are still close together but can move past one another, which allows them to take the shape of their container while keeping a definite volume. Gases, on the other hand, have particles that are far apart and move freely, resulting in no definite shape or volume. Aerosols consist of tiny liquid droplets or solid particles suspended in a gas, which also does not exhibit the definitive characteristics of solids. Therefore, the solid state is distinctly recognized by its fixed shape and volume.