Flux is an interesting word that most don't get. As a verb it's to flow, melt, liquify or expel. As a noun, it's all over: a tide can be in flux (flow), on going change or movement. In chemistry it's used to define oxide removal or block it, also as a coagulant or salt binder. With physics it's the expression of flow rate (energy or particle) or field strength. In mathematics it's a transport vector (again a surface area integral), though is also applied in a scalar (current density).
George, I paid $150 for my first pocket calculator, which was the first or one of them available on the market. This same calculator is still available, now with a little printer roll attached for $10 at Wal-Mart.