Convection, Conduction, Radiation

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What is Convection?

Back

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

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What is Conduction?

Back

Conduction is the transfer of heat through direct contact between materials. It occurs when heat moves from a hotter object to a cooler one.

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What is Radiation?

Back

Radiation is the transfer of energy through electromagnetic waves. It does not require a medium and can occur in a vacuum.

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Example of Convection:

Back

An example of convection is boiling water. The hot water at the bottom rises to the top, while cooler water descends.

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Example of Conduction:

Back

An example of conduction is touching a hot stove. Heat transfers from the stove to your hand.

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Example of Radiation:

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An example of radiation is feeling the warmth of the sun on your skin.

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What happens to fluids during Convection?

Back

In convection, warmer fluids become less dense and rise, while cooler fluids become denser and sink.

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How does Conduction occur?

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Conduction occurs when particles in a material collide and transfer energy to neighboring particles.

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What is the primary source of energy for Earth?

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The primary source of energy for Earth is radiation from the sun.

Front

How does heat transfer in a metal rod placed in a flame?

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Heat transfers through conduction in the metal rod, causing the wax to melt progressively further from the flame.