What is the change of state?

Changes in the state of matter: Because a large number of molecules that make up a substance are doing irregular thermal motion endlessly, different molecules do thermal motion at different speeds, thus forming three states of matter: solid, liquid and gas. The state of matter is called matter state, and the change of matter state refers to the process of matter changing from one state to another. If the gas continues to be heated, it will become a plasma state, which is another material state of the gas at an extremely high temperature of several million degrees Celsius or under the strong collision of other particles.