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!< @brief general physics constants
!< @details all in SI units
real, parameter :: g = 9.81 !< acceleration due to gravity [m/s^2]
real, parameter :: nu_air = 0.000015e0 !< kinematic viscosity of air [m^2/s]
real, parameter :: Pr_m = 0.71 !< molecular Prandtl number (air) [n/d]