[98] Roozeboom, Das Heterogene Gleichgewicht, I. p. 144. See also Schenck, Kristallinische Flüssigkeiten und flüssige Kristalle, p. 8 (Engelmann, 1904).
[99] The possible number of triple points in a one-component system is given by the expression
| n(n - 1)(n - 2) | , |
| 1.2.3 |
where n is the number of phases (Riecke, Zeitschr. physikal. Chem., 1890, 6, 411). The number of triple points, therefore, increases very rapidly as the number of possible phases increases.
[100] Duhem, Zeitschr. physikal. Chem., 1891, 8. 371. Cf. Roozeboom, Das Heterogene Gleichgewicht, p. 94 ff.
[101] Roozeboom, Das Heterogene Gleichgewicht, I. p. 99.
[102] Roozeboom, Zeitschr. physikal. Chem., 1888, 2. 474.
[103] These changes can be predicted quantitatively by means of the thermodynamic equation,
| dp | = | Q | , |
| dt | T(v2 - v1) |
provided the specific volumes of the phases are known, and the heat effect which accompanies the transformation of one phase into the other.