How does the specific gravity of the fluid affect Cv calculations?

The specific gravity of the fluid affects Cv calculations because it changes the density of the fluid, which in turn affects the flow rate. For example, a fluid with a higher specific gravity will have a lower flow rate than water at the same pressure drop. To account for this, Cv can be calculated using a formula that takes into account the specific gravity of the fluid, such as the formula: Cv = Q / √(ΔP / SG), where Q is the flow rate, ΔP is the pressure drop, and SG is the specific gravity of the fluid.