Fourier’s Law is also known as the law of heat conduction. Conduction refers to the transfer of heat (or internal energy) through direct contact which takes place in all 3 phases: solid, liquid, and gas. Heat will always flow from a region of higher concentrated energy to a region of lower concentrated energy. For example, a beaker of water at room temperature is placed on a hotplate. The heat is conducted from the surface of the hotplate to the bottom of the beaker. There is a temperature difference between the hotplate and the bottom of the beaker. Over time, this temperature difference decays over time and as a result, the thermal equilibrium is achieved.