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## Main Question or Discussion Point

P

In the derivation of this equation from the theorem of Work-Kinetic Energy, pressures ( P

_{1}+ ρgh_{1}+ 0.5ρv^{2}_{1}= P_{2}+ ρgh_{2}+ 0.5ρv^{2}_{2}In the derivation of this equation from the theorem of Work-Kinetic Energy, pressures ( P

_{1}and P_{2}) represent are derived from F = PA, forces affected by other portions of fluid upon the fluid in the middle (which is our concern) at 2 different points. So do we consider them the pressure of the fluid itself or the pressure exerted by surroundings on the fluid?