Heat and Mass Transfer
Fourier's law of heat conduction is valid for

Two dimensional cases only
Three dimensional cases only
One dimensional cases only
Regular surfaces having non-uniform temperature gradients

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Heat and Mass Transfer
According of Kirchhoff's law

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

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Heat and Mass Transfer
According to Prevost theory of heat exchange

All bodies above absolute zero emit radiation
It is impossible to transfer heat from low temperature source to t high temperature source
Heat transfer by radiation requires no medium
Heat transfer in most of the cases takes place by combination of conduction, convection and radiation

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