Heat conduction is the transfer of heat between two objects in direct contact with each other. The rate of heat transfer \(Q/t\) (energy per unit time) is proportional to the temperature difference \(...Heat conduction is the transfer of heat between two objects in direct contact with each other. The rate of heat transfer \(Q/t\) (energy per unit time) is proportional to the temperature difference \(T_2 - T_1\) and the contact area \(A\) and inversely proportional to the distance between the objects: \[\dfrac{Q}{t} = \dfrac{kA(T_2 - T_1)}{d}.\]