heat transfer

Front

What is heat energy?

Back

Heat energy is the energy that comes from the temperature of matter. It is the energy that is transferred from one body or system to another due to a temperature difference.

Front

What happens to molecules when they are heated?

Back

When molecules are heated, they move faster and spread apart, which usually causes the substance to expand.

Front

What is conduction?

Back

Conduction is the transfer of heat through a material without the movement of the material itself, typically occurring in solids.

Front

What is convection?

Back

Convection is the transfer of heat by the movement of fluids (liquids or gases) where warmer parts of the fluid rise and cooler parts sink.

Front

What is radiation?

Back

Radiation is the transfer of heat in the form of electromagnetic waves, such as sunlight, which can travel through a vacuum.

Front

What are convection currents?

Back

Convection currents are the circular motion of fluids caused by the rising of warm fluid and the sinking of cooler fluid.

Front

How does a hot air balloon work?

Back

A hot air balloon rises because the air inside the balloon is heated, making it less dense than the cooler air outside, creating lift.

Front

What is the relationship between molecular movement and temperature?

Back

The quicker a molecule moves, the warmer it is; the slower a molecule moves, the colder it is.

Front

What is an example of conduction?

Back

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

Front

What is an example of convection?

Back

An example of convection is the warm air rising and cool air sinking in a room, creating a circulation of air.