Which factor is NOT considered when discussing thermal conductivity?

Thermal conductivity refers to the ability of a material to conduct heat. When evaluating thermal conductivity, material composition is essential, as different materials have varying atomic structures and bonding types that influence their ability to conduct heat. Temperature also plays a significant role, as many materials exhibit changes in their thermal conductivity with variations in temperature. Pressure can affect the thermal conductivity of gases and certain materials, particularly in the context of how closely packed their molecules are.

Surface area, while important in heat transfer contexts like convection, does not directly affect a material’s intrinsic ability to conduct heat, which is what thermal conductivity measures. Therefore, it is not considered when discussing the thermal conductivity of a material in general terms.