Blackbodies, Emissivity and Real Surfaces
where: ε = emissivity of the radiating surface
The maximum radiation rate at which energy can be emitted
a surface is given by:
= Surface area perpendicular to heat transfer (m2)
= Stefan-Boltzmann Constant = 5.67 x 10-8 W/(m2-K4)
= Absolute temperature of the surface (K)
The emissivity of a surface, ε, quantifies its ability to radiate.
A blackbody has an emissivity of one (ε = 1) and real substances have an emissivity between zero and one (0 <ε< 1).
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