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deinonychus commented on the word probability current
In quantum mechanics, the probability current (sometimes called probability flux) is a mathematical quantity describing the flow of probability density. Intuitively; if one pictures the probability density as an inhomogeneous fluid, then the probability current is the rate of flow of this fluid (change in probability per unit time). This is analogous to hydrodynamic mass currents and electromagnetic charge currents. (Wikipedia)
January 31, 2012