def viscosity(t: float) -> float:
    """Calculates the dynamic vicosity of the air (neta (greek letter)).

    Args:
        t (float): Air temperature [K].

    Returns:
        float: Air dynamic vicosity [Ns/(m^2)].
    """
    return 7.72488e-8 * t - 5.95238e-11 * t**2 + 2.71368e-14 * t**3