Conduction, Convection, 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

An example of conduction is an egg cooking in a frying pan, where heat is transferred from the pan to the egg.

Front

What is convection?

Back

Convection is the transfer of heat through the movement of fluids (liquids or gases). It occurs when a hot liquid or air expands, becomes less dense, and rises, while cooler, denser liquid or air sinks.

Front

Give an example of convection.

Back

An example of convection is boiling water in a pot, where hot water rises to the top and cooler water sinks.

Front

What is radiation?

Back

Radiation is the transfer of heat through electromagnetic waves. It does not require a medium (like air or water) to transfer heat.

Front

Give an example of radiation.

Back

An example of radiation is heat from the sun warming your skin.

Front

In heat transfer, heat always flows from __________ to __________.

Back

Hotter to colder.

Front

What is the definition of thermal equilibrium?

Back

Thermal equilibrium is the state in which two objects in contact with each other reach the same temperature and no heat flows between them.

Front

What is the role of density in convection?

Back

In convection, hot fluids become less dense and rise, while cooler fluids are denser and sink, creating a circulation pattern.

Front

What is a good insulator?

Back

A good insulator is a material that does not conduct heat well, such as rubber, wood, or plastic.