Conduction, Convection, and Radiation (edited 2021)

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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, allowing heat to flow from the hotter object to the cooler one.

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What is convection?

Back

Convection is the transfer of heat through the movement of fluids (liquids or gases). It occurs when warmer, less dense fluid rises and cooler, denser fluid sinks, creating a circulation pattern.

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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.

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Example of conduction in everyday life?

Back

An example of conduction is when you touch a metal spoon that has been sitting in a hot pot of soup; the heat from the soup transfers to the spoon and then to your hand.

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Example of convection in everyday life?

Back

An example of convection is boiling water; as the water at the bottom heats up, it rises to the top, while cooler water descends, creating a circular motion.

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Example of radiation in everyday life?

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An example of radiation is feeling the warmth of the sun on your skin; the sun's heat travels through space and warms you without needing air.

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How does a hot air balloon rise?

Back

A hot air balloon rises due to convection; the air inside the balloon is heated, becoming less dense than the cooler air outside, causing it to rise.

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What happens to ice cream in the sun?

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The sun melts an ice cream cone through radiation; the heat from the sun warms the ice cream directly.

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How does ironing clothes work?

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Ironing works through conduction; the hot iron transfers heat directly to the fabric, removing wrinkles.

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What is the role of density in convection?

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Density plays a crucial role in convection; warmer fluids are less dense and rise, while cooler fluids are denser and sink, creating a convection current.