The document discusses energy transfer through various mediums. It covers 3 main points: 1) Energy can be transferred through conduction, where energy is transferred through direct contact between particles in a medium. 2) Energy can also be transferred through convection, where the transfer of energy occurs in a fluid (liquid or gas) through currents that are produced by the uneven heating of the fluid. 3) Radiation is the transfer of energy by electromagnetic waves and does not require a medium for transfer. It can travel through empty space.

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