Question

In a steady state of heat flow through conduction, the thermal current H through a bar of cross section area A is given by H = kA(ΔT/Δl), where ΔT/Δl is temperature gradient along the bar and k is the coefficient of thermal conductivity of the material of the bar. In the above expression the term Δl/(kA) is called thermal resistance offered by a section of bar having length Δl.

An aluminum piece and a wooden piece have been left in a room for a few hours. When you go and touch them the aluminum seems colder than wood. Select the correct option. Assume room temperature to be 25°.