Heat Transfer

Front

What is conduction?

Back

Conduction is the transfer of heat through direct contact between materials. For example, when a metal spoon is placed in a hot soup, the heat from the soup warms the spoon.

Front

What is convection?

Back

Convection is the transfer of heat through the movement of fluids (liquids or gases). For example, warm air rising in a room creates a convection current.

Front

What is radiation?

Back

Radiation is the transfer of heat in the form of electromagnetic waves. For example, heat from the sun reaches the Earth through radiation.

Front

How does heat transfer occur when you touch a hot surface?

Back

Heat transfer occurs through conduction when you touch a hot surface, as heat moves from the hot surface to your cooler hand.

Front

What happens to warm air in a room?

Back

Warm air rises because it is less dense than cooler air, creating convection currents in the room.

Front

What is an example of conduction in everyday life?

Back

An example of conduction is when you walk on hot sand at the beach; the heat from the sand transfers to your feet.

Front

What is an example of convection in nature?

Back

An example of convection in nature is the movement of magma in the Earth's mantle, where hot magma rises and cooler magma sinks.

Front

What is an example of radiation in everyday life?

Back

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

Front

What is the role of density in convection?

Back

In convection, warmer fluids are less dense and rise, while cooler fluids are denser and sink, creating a cycle.

Front

How does a thermometer work using conduction?

Back

A thermometer works by conduction as the liquid inside expands when heated, rising in the tube to indicate temperature.