def V_to_rho(V, MW):
    """
    Return the density (rho) in kg/m^3 given the molar volume (V) in
    m^3/mol and molecular weight (MW) in g/mol.

    .. math::
        \\rho = \\frac{MW}{1000\\cdot V}
    
    Parameters
    ----------
    V : float
        Molar volume, [m^3/mol]
    MW : float
        Molecular weight, [g/mol]

    Returns
    -------
    rho : float
        Density, [kg/m^3]

    Examples
    --------
    >>> rho(0.000132, 86.18)
    652.8787878787879

    """
    return MW / V / 1000.0
