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Nucleation rate data, obtained from expansion wave tube experiments, are reported for several vapor-gas mixtures at high pressure. Results are given for water-vapor in the presence of helium and nitrogen gas, and for n-nonane in helium and methane. For all these mixtures, carrier gas pressures of 10, 25, and 40 bar have been applied, with temperatures ranging from 230 to 250 K. An extended form of the nucleation theorem ͑in terms of the derivative of the nucleation rate with respect to carrier gas pressure͒ is derived, which appears to be very helpful in the interpretation of high pressure data. It can be used to obtain the carrier gas content of the critical nucleus directly from the pressure dependence of experimental nucleation rates. Combining this method with the theoretical considerations of part I of this paper ͓J. Chem. Phys. 111, 8524 ͑1999͒, preceding paper͔: the nucleation behavior of water at high pressures of both helium and nitrogen can quantitatively be understood. For n-nonane in helium our ''pressure perturbation approach'' is also valid. For n-nonane in methane, however, this approach fails because of the high methane solubility in the liquid phase.

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New experimental high-pressure nucleation results of n-nonane in methane and first nucleation rate data of water in methane are presented. The nucleation behavior of the ternary system water and n-nonane in methane is investigated experimentally. For this purpose, a new dedicated mixture preparation device was designed, rendering more accurate and controllable vapor fractions. This has eliminated the large scatter in the nucleation rates of n-nonane in methane at 40 bar and 240 K, previously measured. These experiments also show that nucleation theories are unable to predict the rates (even qualitatively) at these extreme conditions. The composition of the critical cluster is determined for all of the binary systems investigated, by applying the nucleation theorem. Furthermore, a criterion for the application of one component theories to binary gasvapor systems is applied. The nucleation data for the ternary mixtures are analyzed using the experimental results for the binary mixtures. From this, it can be concluded that water and n-nonane nucleate independently in mixtures of water, n-nonane, and methane. † Part of the special issue "Howard Reiss Festschrift".