def sigma_Bird_Stewart_Lightfoot_melting(Vm):
    """Calculates Lennard-Jones molecular diameter.
    Uses molar volume of a liquid at its melting point. CSP method by [1]_.

    .. math::
        \\sigma = 1.222 V_{m,sol}^{1/3}

    Parameters
    ----------
    Vm : float
        Melting molar volume of a liquid at its melting point [m^3/mol]

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

    Notes
    -----
    Original units of Vm are mL/mol.

    Examples
    --------
    >>> sigma_Bird_Stewart_Lightfoot_melting(8.8e-05)
    5.435407341351406

    References
    ----------
    .. [1] Bird, R. Byron, Warren E. Stewart, and Edwin N. Lightfoot.
       Transport Phenomena, Revised 2nd Edition. New York:
       John Wiley & Sons, Inc., 2006
    """
    Vm = Vm * 1000000.0
    sigma = 1.222 * Vm ** (1 / 3.0)
    return sigma
