heat transfer and water cycle

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 in the context of heat transfer?

Back

Radiation is the transfer of heat in the form of electromagnetic waves, such as infrared radiation, which can occur in a vacuum.

Front

How does warm air behave in a room?

Back

Warm air is less dense than cold air, so it rises to the ceiling, creating convection currents.

Front

What happens to cold air in a room?

Back

Cold air is denser than warm air, so it sinks to the bottom of the room.

Front

What is the role of the sun in the water cycle?

Back

The sun provides the energy needed for evaporation, which is a key process in the water cycle.

Front

Define the term '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 is the difference between conduction and convection?

Back

Conduction is the transfer of heat through direct contact between materials, while convection involves the movement of fluids.

Front

What is an example of radiation in everyday life?

Back

An example of radiation is feeling warmth from the sun or a heat lamp without direct contact.

Front

Explain how a lava lamp demonstrates convection.

Back

In a lava lamp, the colored liquid heats up, becomes less dense, and rises, while cooler liquid sinks, creating a continuous flow.

Front

What is the significance of density in heat transfer?

Back

Density affects how fluids move; warmer, less dense fluids rise, while cooler, denser fluids sink, driving convection currents.