def sigma_Stiel_Thodos(Vc, Zc):
Vc = Vc*<NUM_LIT><EOL>sigma = <NUM_LIT>*Vc**(<NUM_LIT:1>/<NUM_LIT>)*Zc**(-<NUM_LIT>)<EOL>return sigma<EOL>
r'''Calculates Lennard-Jones molecular diameter.
    Uses critical volume and compressibility. CSP method by [1]_.

    .. math::
        \sigma = 0.1866 V_c^{1/3} Z_c^{-6/5}

    Parameters
    ----------
    Vc : float
        Critical volume of fluid [m^3/mol]
    Zc : float
        Critical compressibility of fluid, [-]

    Returns
    -------
    sigma : float
        Lennard-Jones molecular diameter, [Angstrom]

    Notes
    -----
    Vc is originally in units of mL/mol.

    Examples
    --------
    Monofluorobenzene

    >>> sigma_Stiel_Thodos(0.000271, 0.265)
    5.94300853971033

    References
    ----------
    .. [1] Stiel, L. I., and George Thodos. "Lennard-Jones Force Constants
       Predicted from Critical Properties." Journal of Chemical & Engineering
       Data 7, no. 2 (April 1, 1962): 234-36. doi:10.1021/je60013a023