Which state of matter has a definite shape and volume?

The state of matter that has a definite shape and volume is solid. In solids, the particles are closely packed together and vibrate in place, which allows solids to maintain a fixed shape and volume. This characteristic distinguishes solids from liquids and gases.

In liquids, the particles are still close together but can move past one another, allowing liquids to take the shape of their container while retaining a constant volume. Gases, on the other hand, have particles that are much farther apart and move freely, leading to neither a definite shape nor a definite volume. Plasma, similar to gas, occurs at high temperatures and consists of charged particles, and it also lacks a definite shape and volume. Understanding these properties helps clarify why solids are unique in having both a definite shape and volume.