This was observed by diamond deposition on iron substrates where, due to the highvaporpressure of iron, ballas is formed at methane concentrations lower than 0.4%.
Above the critical temperature and under highpressure the vapor may become as dens and as incompressible as the liquid at lower temperature.
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。
3
The existing density compensator model does not fit high temperature and pressure saturated vapor, the density compensator precision is low and causes big error in saturated vapor measurement.