where g = g(p1 - p2 )/p1 is the reduced gravity of the system. P is at its absolute minimum, Pmin, when y = 0, and given by the first term on the rhs of the above. When Y = 0, no rearrangement of fluid can lower the center of mass, since all dense fluid lies beneath all light fluid. When y = 0, however, P exceeds Pmin, and the fluid has available potential energy in the amount
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