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Unit 11.1 ­ How is heat (thermal energy) transferred and what factors
affect the rate at which heat is transferred?

Thermal (infra-red) radiation is the transfer of energy by electromagnetic
All bodies emit and absorb thermal radiation.
The hotter the body the more energy is radiates.
Dark, matt surfaces…

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Convection is the transfer of heat energy through
movement of particles. It is the transfer of heat energy
through fluids by the upward movement of warmer, less
dense, regions in the fluid.

Convection occurs in liquids and gases and created
convection currents.

1. The particles in the liquid or…

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absorb more radiation than light shiny surfaces.


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