Hard-cores of molecules of simple fluids

The diameters of hard−cores of molecules of simple fluids (Ar, Kr, Xe) have been deduced from analysis of isothermal compressibility data in light of hard−sphere equations of state. The hard−core diameter σ thus obtained is found to decrease slightly as temperature is increased. The results can be represented in a generalized form in terms of reduced variables σ[(6/π)(?c/?)]−1/3 = 0.549058 − 0.010827 T/Tc with standard deviation of 0.000731.