Hydration state

Equilibrium pressure, P [Pa]

0 ⇔ 0.3

0.3 ⇔ 1

1 ⇔ 2

$P=\exp \left(-69304.7/R/T+148.85/R\right)$

$P=\exp \left(-59519.5/R/T+132.69/R\right)$

$P=\exp \left(-47460.5/R/T+106.42/R\right)$