气相中的物质现在想压缩，下降到液体。
Stuff in the gas phase now wants to condense down into the liquid.
液体是压缩的相。
在临界温度以上和高压下，蒸汽密度可能变得象在低温下液体那样稠密且不可压缩。
Above the critical temperature and under high pressure the vapor may become as dens and as incompressible as the liquid at lower temperature.
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