Heat Transfer

Front

What is heat transfer?

Back

Heat transfer is the movement of thermal energy from one object or substance to another due to a temperature difference.

Front

What are the three main types of heat transfer?

Back

The three main types of heat transfer are conduction, convection, and radiation.

Front

Define conduction.

Back

Conduction is the transfer of heat through direct contact between materials, where heat moves from the hotter object to the cooler one.

Front

Give an example of conduction.

Back

An example of conduction is when a metal spoon gets hot after being placed in a hot cup of coffee.

Front

Define convection.

Back

Convection is the transfer of heat through the movement of fluids (liquids or gases) caused by differences in temperature and density.

Front

Give an example of convection.

Back

An example of convection is the warm water rising to the surface in a swimming pool.

Front

Define radiation.

Back

Radiation is the transfer of heat in the form of electromagnetic waves, such as infrared radiation, without the need for a medium.

Front

Give an example of radiation.

Back

An example of radiation is feeling warmth from the sun while sunbathing.

Front

What happens to warm air in convection?

Back

Warm air is less dense and rises, while cooler air is denser and sinks, creating a convection current.

Front

How does a microwave heat food?

Back

A microwave heats food through radiation, using microwaves to excite water molecules in the food.