Conversion of Linear Velocity to Volumetric Flow Rate or to Mass Flow Rate

See example conversions of linear velocity to volumetric flow rate and vice versa in this article.The continuity equation, expressing the principle of conservation of mass for a fluid flow system, is used for a variety of pipe flow and open channel flow calculations. Continuity equation calculations use different flow rate parameters, and it is sometimes be necessary to make a conversion of linear velocity to volumetric flow rate, or to make other flow rate conversions. The compressible continuity equation is written in terms of mass flow rate, because the fluid density may be changing. The incompressible continuity equation is written in terms of volumetric flow rate or in terms of average velocity and fluid cross-sectional area.