def schmdt_nmbr_laminar(kc, kinematic_visc = 1.516e-5):
    """
    Return the laminar Schmidt number [], it uses air coefficient as default
    source : ALOHA

    Parameters
    ----------
    kc : molecular diffusivity [m²/s]
    kinematic_visc : kinematic viscosity of air, default 1.516e-5 [m²/s] (20°C)

    """
    return kinematic_visc/kc