
Why Does Specific Gravity Matter in Mixer Design?
What Is Specific Gravity and Why Is It Important in Mixing? Specific gravity (SG) is a dimensionless measure that compares the density of a substance to the density of water. In mixer design, it plays a critical role because it directly influences the energy needed to mix a fluid and affects how fluid layers interact within a tank. Understanding SG helps engineers select the right mixer setup, including impeller type, size, and drive system. Specific gravity is calculated as: SG = _(P)fluid_ (P)water Where: (P)fluid is the fluid density (kg/m^3) (P)water is typically 1,000 kg/m^3 at 4°C A specific gravity greater than 1 means the fluid is denser than water. Many industrial fluids—like slurries, oils,




