Reynolds number is a dimensionless parameter used in fluid mechanics to predict flow regimes—laminar or turbulent— by comparing inertial forces to viscous forces. It is calculated as Re = (ρVD)/μ, where ρ is fluid density, V is velocity, D is characteristic length, and μ is dynamic viscosity. It’s critical in pipe flow, aerodynamics, and heat transfer design standards. --- Accelerate Mechanical Engineering⚙️ Start 40 Industry-ready Mechanical Courses like GD & T, AutoCAD, Solidworks, CATIA V5, F