Types of Heat Transfer

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What is heat transfer?

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Heat transfer is the movement of thermal energy from one object or substance to another due to a temperature difference.

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What are the three main types of heat transfer?

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The three main types of heat transfer are conduction, convection, and radiation.

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.

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What is convection?

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Convection is the transfer of heat in fluids (liquids and gases) where warmer, less dense fluid rises and cooler, denser fluid sinks.

Front

What is radiation?

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Radiation is the transfer of heat in the form of electromagnetic waves, which can occur in a vacuum, such as sunlight warming the Earth.

Front

Why does water expand when it freezes?

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Water expands when it freezes because the molecules arrange themselves in a crystalline structure that takes up more space.

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How does heat move between objects?

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Heat moves from a warmer object to a cooler object until thermal equilibrium is reached.

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What happens to warm air in a room?

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Warm air rises because it is less dense than cooler air, which sinks.

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What is an example of conduction?

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An example of conduction is a metal spoon getting hot when placed in a pot of hot soup.

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What is an example of convection?

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An example of convection is boiling water, where hot water rises to the top and cooler water sinks.