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I have the following question:

State an equation for conservation of mass and use it to show that fluids of constant density are incompressible

My solution (1):

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My solution (2):

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I don't know how to use the 2nd equation for conservation of mass the get the solution.

Fluid of constant density means that $\frac{\partial p}{\partial t} =0 $ but it doesn't mean $\frac{Dp}{Dt} =0 $

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