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**The flow continuity equation**- Taking the average speed:

Section A x Speed A = Section B x Speed B = constant volume flow

- we deduce the velocity at point B

- We estimated in formulas continuity flow volume above, the fluid is incompressible. For a compressible fluid continuity equation must be applied to the mass flow rate:

Section A x Speed A= Section B xSpeed B = mass flow constant

- The equation of continuity applied to constant mass flow gives us:

Density A x Volume A x Section A = Density B x Volume B x SectionB

For all fumulas aboves:

- Density in kg/m3
- volume in m3
- section in m²
- spedd in m/sec
- volume flow in m3/sec
- mass flow in kg/sec