Albedo α - ratio of the power of radiation scattered from the body to the total power incident on the body, Intensity I - power of radiation received per unit area, emissivity e - measure of how effectively a body radiates, Black body - perfect radiator as well as a perfect absorber of radiation, Conduction - Mode of transfer of heat in solids due to the vibration of molecules about their equilibrium position, Convection - Mode of transfer of heat in fluids due to the actual motion of particles, Radiation - Mode of transfer of heat that doesn't need a medium, Green house effect - the warming of the Earth caused by infrared radiation, emitted by the Earth’s surface, which is absorbed by various gases in the Earth’s atmosphere and is then partly re-radiated towards the surface., Solar constant S - The intensity of radiation received at the top of the Earth's atmosphere. S= 1400 Wm-2, Resonance - When the driving frequency of the driving system equals the natural frequency of a system it vibrates with a maximum amplitude,

8.2 Thermal Energy transfer

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