The Fourier’s law of heat conduction, which is the fundamental law explaining how the heat is transferred through materials can be used to see the relationship between the temperature and the heat flow in the system. This law states that the amount of heat energy passing through a small portion of an area (A) of a material, which is called heat flux density and denoted by formula_1 is equivalent to thermal conductivity (k) multiplied by the change in the temperature with respect to position, which can be denoted as formula_2. This relationship in an equation form can be written as,