Many assumptions were made in formulating flow equations from physical conservation laws. Suffice
it to say, the flow formulae you have seen so far in this chapter are only approximations of reality.
Orifice plates are some of the worst offenders in this regard, since the fluid encounters such abrupt
changes in geometry passing through the orifice. Venturi tubes are nearly ideal, since the machined
contours of the tube ensure gradual changes in fluid pressure and minimize turbulence