Definition of flux

The word "flux" has its roots in Middle English and is derived from the Old French word "fluer," meaning "to flow" or "to flow out." The past participle form of this word was "flux," which came to refer to any substance that flowed freely, such as molten metal or a liquid magma. In chemistry, "flux" refers to a continuous flow of material - usually a liquid or gas - that is moving through a system, often as a result of some chemical process. This can refer to the flow of material through an extraction process, the movement of a reactant through a reactor, or the diffusion of a substance through a membrane. Overall, the word "flux" is central to various scientific and engineering fields, as it describes the dynamic behavior of materials that are in a state of constant motion or transformation.