Souders-Brown Equation formula  V = k ×√(ρL - ρV)/ρV
Where:
V: Maximum Allowable Vapor Velocity, in m/s
ρL: Liquid Density, in Kg/m^3
ρV: Vapor Density, in Kg/m^3
k: Vapor Velocity Factor, in m/s

Souders-Brown Equation calculates the maximum allowable vapor velocity in vapor-liquid separation vessels.