Heat and Mass Transfer
Fourier's law of heat conduction gives the heat flow for

Nonuniform temperature surfaces
Two dimensional cases only
One dimensional cases only
Irregular surfaces

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Heat and Mass Transfer
According of Kirchhoff's law

Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body
Radiant heat is proportional to fourth power of absolute temperature
Emissive power depends on temperature
Emissive power and absorptivity are constant for all bodies

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