Question

The amount of heat flow through a unit area of material of unit thickness in one hour, when the temperature difference is maintained at 1°C is known as ___________ of the material.

(a) Thermal conductivity

(b) Thermal resistivity

(c) Thermal conductance

(d) Thermal resistance

This question was posed to me in an international level competition.

The origin of the question is Thermal Insulation in portion Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials

Answer 1

Right answer is (a) Thermal conductivity

To explain I would say: The amount of heat flow through a unit area of material of unit thickness in one hour, when the temperature difference is maintained at 1°C is known as the thermal conductivity. It is denoted by k. Its units are W/(mK).