Thermal Energy - 7th

Front

What is thermal energy?

Back

Thermal energy is the total kinetic energy of the particles in a substance, which is related to its temperature.

Front

What is 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

What is convection?

Back

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

Front

What is radiation?

Back

Radiation is the transfer of heat in the form of electromagnetic waves, which can occur in a vacuum and does not require matter.

Front

What is 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

How does a hot air balloon work?

Back

A hot air balloon inflates when thermal energy from a heat source warms the air inside the balloon, causing it to rise due to lower density compared to the cooler air outside.

Front

What is an example of heat transfer by convection?

Back

An example of heat transfer by convection is when warm air rises in a chimney.

Front

Why does an ice cube melt in a warm room?

Back

An ice cube melts in a warm room because heat from the room is absorbed by the ice cube, increasing its temperature.

Front

What is the role of temperature in thermal energy?

Back

Temperature is a measure of the average kinetic energy of particles in a substance; higher temperatures indicate higher thermal energy.

Front

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

Back

When a substance is heated, its particles gain kinetic energy, move faster, and may spread apart, leading to changes in state or volume.