Thermal Energy Transfers

Front

What is thermal energy?

Back

Thermal energy is the energy that comes from the temperature of matter. It is the total kinetic energy of the particles in an object.

Front

What is conduction?

Back

Conduction is the transfer of heat through direct contact between materials. It occurs when two objects at different temperatures touch each other.

Front

What is convection?

Back

Convection is the transfer of heat through the movement of fluids (liquids or gases). Warmer, less dense fluid rises while cooler, denser fluid sinks.

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, allowing heat to be transferred through empty space.

Front

How does conduction occur in a metal spoon in hot coffee?

Back

The heat from the hot coffee transfers to the spoon through direct contact, causing the spoon to become hot.

Front

How does radiation heat a chair near a fireplace?

Back

The heat from the fire radiates through the air and warms the chair without direct contact.

Front

What causes warm air to rise in a room?

Back

Warm air is less dense than cool air, so it rises due to convection.

Front

What is an example of convection in everyday life?

Back

An example of convection is the way warm air rises from a heater, creating a circulation of warm air in a room.

Front

What happens to the temperature of a substance when it absorbs thermal energy?

Back

When a substance absorbs thermal energy, its temperature increases as the kinetic energy of its particles increases.

Front

What is the role of density in convection?

Back

Density differences in fluids cause convection currents, where warmer, less dense fluid rises and cooler, denser fluid sinks.