Conduction
conduction (or heat conduction) is a mode of transfer of energy within and between bodies of matter, due to a temperature gradient. Conduction means collisional and diffusive transfer of kinetic energy through particles of ponderable matter (as distinct from photons). Conduction takes place in all forms of ponderable matter, such as solids, liquids, gases and plasmas. Heat spontaneously tends to flow from a body at a higher temperature to a body at a lower temperature. In the absence of external driving fluxes, temperature differences, over time, approachthermal equilibrium.
Convection
Convection is the concerted, collective movement of ensembles of molecules within fluids (e.g., liquids, gases) andrheids. Convection of mass cannot take place in solids, since neither bulk current flows nor significant diffusion can take place in solids
Radiation
Thermal radiation is electromagnetic radiation generated by the thermal motion of charged particles in matter. All matter with atemperature greater than absolute zero emits thermal radiation. The mechanism is that bodies with a temperature above absolute zero have atoms or molecules with kinetic energies which are changing, and these changes result in charge-acceleration and/or dipole oscillation of the charges that compose the atoms
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