Front

When a substance absorbs thermal energy, its particles tend to ______.

Back

speed up

Front

Thermal energy always moves from a ______ area to a ______ area.

Back

warmer, cooler

Front

True or False: Thermal energy always moves from a hotter area to a colder area.

Back

True

Front

A substance might freeze when thermal energy is ______ the substance.

Back

removed from

Front

A chemical reaction that ______ energy can be used to heat up other substances.

Back

releases

Front

What is thermal energy?

Back

The energy that comes from the temperature of matter; it is the total kinetic energy of particles in a substance.

Front

What happens to particles in a substance when it is heated?

Back

The particles move faster and spread apart.

Front

What is conduction?

Back

The transfer of thermal energy through direct contact between materials.

Front

What is convection?

Back

The transfer of thermal energy through the movement of fluids (liquids and gases).

Front

What is radiation?

Back

The transfer of thermal energy through electromagnetic waves, such as light.