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smaller than the uncertainties related to ACP and to some of the parameters in Table I. Since AC" was, in a sense, adjusted to optimize the fit with the hign-density data of Quist, the refinement of fugacity coefficients seemed inappropriate. Debye-Hückel effects were considered and found to be negligible for the very small ionic strengths involved. Also Kw is strictly defined in terms of activity rather than molality. Thus, the effect of an activity (or fugacity) coefficient less than unity for all ions would be to increase the concentration of ions but to leave the activity product and Kv unchanged.

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The mechanism and kinetics of the pressure-induced polymerization of acetylene were studied by Raman spectroscopy. The polymerization reaction occurred in the orthorhombic phase at room temperature and pressures above 3.5 GPa. Dominant formation of trans-polyacetylene suggested that the monomer underwent trans opening of the triple bond and polymerized along the diagonal of the bc plane of the unit cell. The reaction was described as an idealized one-step and one-dimensional growth process by an Avrami equation with an exponent 1.34.