Phase Change Diagrams

A phase change is a transition of matter from one state to another, such as solid, liquid, or gas.

Solid, liquid, and gas.

Energy is either absorbed or released during a phase change.

Melting is the phase change from solid to liquid.

Freezing is the phase change from liquid to solid.

Condensation is the phase change from gas to liquid.

Evaporation is the phase change from liquid to gas.

A phase change diagram illustrates the states of matter and the transitions between them as temperature and pressure change.

The line segment A-B represents the solid state.

During a phase change, the temperature remains constant.