The rate of heat transfer across any
plane normal to the x-direction is proportional to the wall area and the
temperature gradient in the x-direction. This statement is also referred to as _______.
Second law of thermodynamics
Kelvin’s law
Third law of thermodynamics
Fourier’s law
Fourier’s law
The law of heat conduction also known as Fourier’s law, states that the rate of heat transfer through a material is proportional to the negative gradient in the temperature and to the area, at right angles to that gradient, through which the heat flows.
For one dimensional or x-direction.
Hence, the correct option is (D).
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