Consider a medium in which the heat conduction equation is given in its simplest form as   (a) Is heat transfer steady or transient? (b) Is heat transfer one-, two-, or three-dimensional? (c) Is there heat generation in the medium? (d ) Is the thermal conductivity of the medium constant or variable?

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A: Q= h A ( T2-T1) q= Q/A = h( T2-T1)

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.