Convection, Conduction, and Radiation

Front

What is conduction?

Back

Conduction is the transfer of heat through direct contact between materials. It occurs when heat moves from a hotter object to a cooler one through physical touch.

Front

Give an example of conduction.

Back

Touching a hot piece of metal is an example of conduction, as heat transfers from the metal to your skin.

Front

What is convection?

Back

Convection is the transfer of heat through the movement of fluids (liquids or gases). It occurs when warmer areas of a liquid or gas rise and cooler areas sink.

Front

Give an example of convection.

Back

A large house being heated by a heater warms the house when the air circulates, demonstrating convection.

Front

What is radiation?

Back

Radiation is the transfer of heat in the form of electromagnetic waves. It does not require a medium to travel through.

Front

Give an example of radiation.

Back

Getting sunburned is an example of radiation, as heat from the sun travels through space to warm your skin.

Front

How does a microwave transfer heat?

Back

A microwave primarily uses radiation to transfer heat, cooking food by emitting microwave radiation that excites water molecules.

Front

What is the direction of heat flow in heat transfer?

Back

In heat transfer, heat always flows from the hotter substance to the colder substance.

Front

What is the role of a glass screen in a fireplace?

Back

The glass screen allows heat to radiate towards the room while preventing direct contact with the flames.

Front

What happens to air when it is heated?

Back

When air is heated, it becomes less dense and rises, creating a convection current.