Perhaps in physics, but in other contexts one would be more appropriate than the other. While the two words have some definitions in common, not all uses of flux can be interchanged with flow, and vice-versa. For example, flux can mean a flow of fluid, or continuous movement, which could likely be interchanged with flow, but flux can also mean a series of changes or a state of continual change.
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Ruca Can the words 'flux' and 'flow'Please note the correct way to ask a question.canbe used interchangeably?