How is "thermal conductivity" defined?

Thermal conductivity is defined as the ability of a material to conduct heat. It quantifies how easily heat can pass through a substance when there is a temperature difference across it. Materials with high thermal conductivity, such as metals, can transfer heat quickly, making them effective conductors. Conversely, materials with low thermal conductivity, like wood or insulation, do not transfer heat as efficiently, which makes them better for thermal insulation.

Understanding thermal conductivity is crucial in various applications, such as thermal management in engineering, where selecting materials with appropriate thermal properties can significantly impact the efficiency and safety of systems involving heat transfer. Thus, recognizing that thermal conductivity specifically pertains to the conduction of heat is essential for anyone studying power engineering and related fields.