• The formulas for compressible gas were taken from Engineering Fluid Mechanics, 3rd edition, by Roberson/Crowe.
• Fluid specific gravity is taken from many sources including manufacture's MSDS.
• A Cd factor (Coefficient of discharge) of 0.65 is common use. However, different flow geometry's may produce different Cds.
• Viscosity is not used in the equation. The Cd factor calculations take the viscosity in to consideration.

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