What are the assumptions needed to reduce the continuity equation DM/Dt = partialderivative/partialderivative integral_cv rho d for all + integral_cs rho V vector middot n cap d A to V_1 A_1 = V_2 A_2? Solution Flow is steady(velocity at each point is constant with time) Fluid is incompressible (density is constant) Flow is irrotational (no turbulence) Flow is non viscous.