Phase Changes and Phase Change Diagrams

Front

What is condensation?

Back

The phase change from water vapor to liquid water.

Front

What is absolute zero?

Back

The lowest possible temperature, -273.15 degrees Celsius or 0 degrees Kelvin.

Front

What happens during a phase change?

Back

The substance changes from one state of matter to another, such as solid to liquid or liquid to gas.

Front

What is a heating curve?

Back

A graph that shows the temperature of a substance as it is heated over time.

Front

What is boiling point?

Back

The temperature at which a liquid turns into vapor.

Front

What is evaporation?

Back

The process by which liquid turns into vapor at temperatures below its boiling point.

Front

What is sublimation?

Back

The phase change from solid directly to gas without passing through the liquid state.

Front

What is the melting point?

Back

The temperature at which a solid turns into a liquid.

Front

What is thermal energy?

Back

The energy that comes from the temperature of matter; it is the total energy of all the particles in an object.

Front

What is the significance of the flat sections on a heating curve?

Back

They indicate phase changes where temperature remains constant as the substance changes state.