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Reynolds Number ($Re$)

A dimensionless quantity characterizing the ratio of inertial forces to viscous forces. It is defined as Re=ρULμRe = \frac{\rho U L}{\mu}, where ρ\rho is density, UU is characteristic velocity, and LL is characteristic length.
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The statement of the theorem

The Reynolds number (ReRe) is a dimensionless ratio quantifying the relative importance of inertial forces to viscous forces. It is defined based on the fluid properties and characteristic scales:\nRe=ρULμ Re = \frac{\rho U L}{\mu} \nwhere ρ\rho is the fluid density (kg/m3\text{kg/m}^3), UU is the characteristic free-stream velocity (m/s\text{m/s}), LL is the characteristic length scale (m\text{m}), and μ\mu is the dynamic viscosity (Pa⋅s\text{Pa} \cdot \text{s}). ReRe is a dimensionless quantity.
Source: Wikipedia