Suppose that heat conduction occurs at a constant rate of đQ/dt in a hollow sphere with an inner radius of r, at temperature T, and an inner radius of r, at temperature T,. Show that for constant thermal conductivity K, the temperature difference between the two surfaces is given by dQ I dT ( 1 т, - т, 2 4л К

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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.