def __scale_gpumd_tc(vol, T):
    """
    Used to scale the thermal conductivity when converting GPUMD heat-flux correlations
    to thermal conductivity.

    Args:
        vol (float):
            Volume in angstroms^3

        T (float):
            Temperature in K

    Returns:
        float: Converted value
    """

    one = 1.602176634e-19 * 9.651599e7  # eV^3/amu -> Jm^2/s^2*eV
    two = 1. / 1.e15  # fs -> s
    three = 1.e30 / 8.617333262145e-5  # K/(eV*Ang^3) -> K/(eV*m^3) w/ Boltzmann
    return one * two * three / (T * T * vol)