Reynolds number: The Reynolds number is a dimensionless quantity used to predict whether fluid flow will be laminar (smooth) or turbulent based on the ratio of inertial forces to viscous forces.
Viscosity:Viscosity is a measure of a fluid's resistance to flow. It determines how easily or difficultly a fluid can deform under an applied shear stress.
Drag force:Drag force is the resistance experienced by an object moving through a fluid due to frictional effects. It depends on factors such as object shape, velocity, and fluid properties.