Question

The coefficient of thermal conductivity k of a material is best defined as:

Options

• Total heat passing in one hour

• Heat per second through a rod of unit length with unit temperature difference

• Heat through a unit cube with unit temperature difference

• Heat per second through unit area for unit temperature difference

Answer 1

Heat per second through unit area for unit temperature difference

Explanation:

Thermal conductivity is defined as heat flow per second through unit area when the temperature difference across the material is one degree.