Abstract
Solid (liquid)-gas equilibria and their phase changes (vaporization, condensation and solid-gas reaction) are important phenomena for understanding processes in the primary solar nebula. Experimental studies of such phenomena have been reviewed in relation to the planetary sciences. Such experiments, called as experiments for condensed phase-gas systems, have several characteristics due to nature of a vapor phase; (1) the entropy of a vapor phase is much larger than that of a condensed phase and (2) the volume of a vapor phase is much larger than that of a condensed phase. The former is responsible for easy thermochemical calculations of solid-gas equilibria and importance of phase change kinetics including a vapor phase, and the later is responsible for not doing experiments in closed systems. Previous work and feature problems on experiments of solid (liquid)-gas equilibriua, vaporization, condensation, and solid-gas reaction have been discussed.
