def saturated_vapor_pressure(T):
    """Calculate pressure of saturated water vapor at specified temperature as described at
    http://wahiduddin.net/calc/density_altitude.htm
    Parameters
    ---------
    t : float
        Temperature [C]

    Returns
    -------
    float
        Pressure [mb]
    """
    eso = 6.1078
    c0 = 0.99999683
    c1 = -0.90826951 * 10 ** -2
    c2 = 0.78736169 * 10 ** -4
    c3 = -0.61117958 * 10 ** -6
    c4 = 0.43884187 * 10 ** -8
    c5 = -0.29883885 * 10 ** -10
    c6 = 0.21874425 * 10 ** -12
    c7 = -0.17892321 * 10 ** -14
    c8 = 0.11112018 * 10 ** -16
    c9 = -0.30994571 * 10 ** -19
    p = c0 + T * (c1 + T * (c2 + T * (c3 + T * (c4 + T * (c5 + T * (c6 + T *
        (c7 + T * (c8 + T * c9))))))))
    return eso / p ** 8
