Qstnid -I-3-in The Derivation Of P<sub>1</sub> - P<sub>2</sub> = Ρgz, It Was Assumed That The Liquid Is Incompressible. Why Will This Equation Not Be Strictly Valid For A Compressible Liquid? - 13: Fluid Mechanics

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#3
In the derivation of P₁ - P₂ = ρgz, it was assumed that the liquid is incompressible. Why will this equation not be strictly valid for a compressible liquid?
Ans : In case of an incompressible liquid, the density is independent of the variations in pressure and always remains constant. But it is not so in case of a compressible liquid. Thus, the given equation will not be strictly valid for a compressible liquid.
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