CONVECTION

  This is the transfer of heat energy through the movement of movement of the particles themselves from a hotter to cooler region.

Fluids-liquids and gases transfer heat energy by convection. They can move around unlike the particles in a solid.

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BBC - Schools - KS3 Bitesize - Science - Physics - Energy Resources and Energy Transfer

RADIATION

  This is transfer of heat energy by waves. Unlike conduction and convection which both transfer heat energy through particles, radiated heat can travel, through a vacuum i.e. an empty space with no particles in it.

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