Zur Abschätzung der kritischen und reduzierten Eigenschaften von Kaliumchlorid

摘要

The critical temperature of KCl is estimated by a linear extrapolation of the molar free surface energy. Then the critical density is deduced from an extrapolation of the rectilinear diameter and the critical pressure from a linear extrapolation of the logarithm of the vapour pressure versus the reciprocal temperature. With the estimated data (Tc=3000 K,Pc=220 bar, ρc= 0.193 g cm−3) the reduced properties of KCl are investigated and compared with other substances. The largest deviation is in the behaviour of the reduced density: That of KCl near the triple point is larger than that of other substances by a factor of 2–3. This is caused mainly by the electrostriction in the ionic