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Flow in the boundary layer is sensitive to pressure, speed, characteristic length and kinematic viscosity. Reynolds number Re is a single dimensionless number that represents the dependency of flow on the above-mentioned parameters. Using formula provided below find Reynolds Number \[ R e=\frac{\rho v l}{\mu} \] with given data: \[ \begin{array}{l} \rho=1.4 \mathrm{~kg} / \mathrm{m} 3 \\ v=40 \mathrm{~m} / \mathrm{s} \\ l=220 \mathrm{~mm} \\ \mathrm{~T}=275 \mathrm{~K} \\ \mathrm{P}=98455 \mathrm{hPa} \end{array} \]

Given that density (rho) = 1