Z 0 p z h ρ gh p 0 p 0 2 γ r ρ gh or δ p 2 γ r

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z = 0 p z = h − ρ gh = p 0 p 0 2 γ R − ρ gh or
Δ P = 2 γ R − ρ gh , where the constant C cancelled out. This driving force is reduced relative to D p by the hydrostatic contribution to the pressure p at z=0 from the column with height h. This is the driving force given in the problem.

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