Compare conduction, convection, and radiation: what do they have in common and how do they differ?

The similarity is that radiation, convection, thermal conductivity are different ways of changing internal energy, types of heat transfer.
Radiation is a form of heat transfer carried out by means of electromagnetic waves. Radiation differs from convection and heat conduction in that no direct contact is required for heat transfer, and heat transfer by radiation can take place even in a complete vacuum.
Convection is the transfer of energy due to the movement of particles of matter (moving particles).
Thermal conductivity is the transfer of heat by structural particles of a substance (molecules, atoms, electrons – a “solid” medium bound by particles of a substance) in the course of their thermal movement or from a more heated area to a less heated area without transfer of matter.

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