. A commentary on the scientific writings of J. Willard Gibbs. Gibbs, Joniah Willard, 1839-1908; Science; Thermodynamics. HETEROGENEOUS EQUILIBRIUM 273 the value of the numerator only. As the Uquid follows the curve Q2Q1 the value of the last two terms of the numerator soon becomes equal to the value of the first term. The numer- ator then becomes zero, dp/dt becomes zero, and the curve has a horizontal* tangent. It will be observed that such a point of maxunum pressure is found on many of the p-t curves. Fig. 8. The ternary system, H20-K20-Si02-Si02. A diagrammatic representation of the p-l c
. A commentary on the scientific writings of J. Willard Gibbs. Gibbs, Joniah Willard, 1839-1908; Science; Thermodynamics. HETEROGENEOUS EQUILIBRIUM 273 the value of the numerator only. As the Uquid follows the curve Q2Q1 the value of the last two terms of the numerator soon becomes equal to the value of the first term. The numer- ator then becomes zero, dp/dt becomes zero, and the curve has a horizontal* tangent. It will be observed that such a point of maxunum pressure is found on many of the p-t curves. Fig. 8. The ternary system, H20-K20-Si02-Si02. A diagrammatic representation of the p-l curves shown in Fig. 7; the numbers on the curves are the same in Figs. 6, 7, and 8. The invariant points Q^a. and Qih are shown as point Qs, and the curves 11 and 12 are not shown. representing univariant equilibrium between two soUds, liquid and vapor in the system. It is most pronounced in the uni- variant equilibrium, K2O • 4Si02 • H2O + SiOa + L -1- V. On further increase in temperature the numerator becomes * Cf. footnote, page 257: -— takes the place of -7- of analytical at dx Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donnan, F. G. (Frederick George), 1870-1956; Haas, Arthur Erich, 1884-1941. New Haven, Yale University Press; London, H. Milford, Oxford University Press
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