Fourier’s Law is 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. It is also a rate equation which determines the conduction heat flux from the temperature distribution in a medium. Heat will always flow from a region of higher concentrated energy to a region of lower concentrated energy and the heat transfer is in the direction of decreasing temperate. For example, a beaker of water at room temperature is placed on a hotplate. The heat transfer is in the direction 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. However, this temperature difference decays over time and as a result, the thermal equilibrium is achieved.


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