Flux is a state of continuous change or movement. In science, it can also mean the rate at which something flows through a surface, like heat, particles, or liquid.
“Flux” comes from Latin “fluxus,” meaning “a flowing,” from “fluere,” to flow. It has been used in English since the Middle Ages for physical and abstract kinds of flow.
The phrase “in flux” is a compact way to say “not settled yet, still changing.” Even in physics, flux is about how much stuff passes through an area—so the word always keeps that sense of movement.
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