Abubakar Tafawa Balewa University Fouriers Law Equation Questions

i need you to answer all questions

Why is there a minus sign in Fouriers law equation?
What is an isotropic material? What is an isothermal surface?
What is thermal conductivity and why thermal conductivity of a solid is generally larger than a fluid?
What is the physical significance of the thermal diffusivity? How is it defined and what are the units?
What is the physical significance of each term in heat equation?
Give some examples of thermal energy generation?
What are the general boundary conditions used to solve the heat equation?
Why does the thermal conductivity of gas increases with temperature?
What is the temperature gradient and what are its units?
Write the heat equation in Cartesian System for a steady -state conditions with no heat generation?

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