MATERIALSHeating and cooling things

• Some materials or objects change when we heat or cool them.

These changes can be reversible (change back) or irreversible (not change back).

When we heat ice cubes they change into water.

How does it change?

• Is it a reversible or an irreversible

change?

This is an irreversible change.

heat

cool

This is an irreversible change.

heat

cool

This is a reversible change.

heat

cool