The flux due to this process is equal to minus a proportionality constant - often abbreviated k - times the gradient of (*) temperature according to Fourier's law.
The ratio of proportionality constants for two different processes with this name are connected by the Lorenz number according to the Wiedemann-Franz law. In lumped system analyses of the transient form of this process, a number proportional to the internal resistance to this process, the Biot number, is used. If there is no internal energy conversion, the steady-state form of this process is described by Laplace's equation. The flux due to this process is equal to minus a proportionality constant - often abbreviated k - times the gradient of (*) temperature according to Fourier's law. For 10 points, name this mode of heat transfer that occurs by microscopic means - without macroscopic motion of a material - as opposed to convection and radiation.
The ratio of proportionality constants for two different processes with this name are connected by the Lorenz number according to the Wiedemann-Franz law.
thermal {conduction} [or word forms; prompt on heat transfer; prompt on heat transport]