. A commentary on the scientific writings of J. Willard Gibbs. Gibbs, Joniah Willard, 1839-1908; Science; Thermodynamics. 260 MOREY ART. G respectively, gives the value of as the constant coefficient of the second term. The equation now becomes dp ^ (t?" - V) - {-n^ - 7?0 lit ~ {V - vO - (v'' - v'Y The numerator of this is always positive. The entropy differ- ence (vapor â tetrahydrate) is always positive. The entropy difference (hexahydrate â tetrahydrate) is negative, since the ^^ iy In ^ «r 5- /^\ 1 ^ I ;<4 < s '^m 1 1 Vt^ / ?: ^s,â^ / 0. o â >^'jy, , , ./ .2 .
. A commentary on the scientific writings of J. Willard Gibbs. Gibbs, Joniah Willard, 1839-1908; Science; Thermodynamics. 260 MOREY ART. G respectively, gives the value of as the constant coefficient of the second term. The equation now becomes dp ^ (t?" - V) - {-n^ - 7?0 lit ~ {V - vO - (v'' - v'Y The numerator of this is always positive. The entropy differ- ence (vapor â tetrahydrate) is always positive. The entropy difference (hexahydrate â tetrahydrate) is negative, since the ^^ iy In ^ «r 5- /^\ 1 ^ I ;<4 < s '^m 1 1 Vt^ / ?: ^s,â^ / 0. o â >^'jy, , , ./ .2 .3 ^ .S £ COMPOSITION W H'£l6//rPe/rC£fT. -â¢Kc? -20 o 20 ao TeMeeKATUKE /N DEGPeSS CENTIGRADE Fig. 3. The binary system, H20-CaCl2. Diagrams .4, B, and C are the projections of the curves representing univariant equilibria in the solid f-i-x model on the p-x, p-i, and t-x planes, respectively. decomposition of hexahydrate into tetrahydrate and solution, to be considered later, absorbs heat, and this negative term is multiplied by a negative coefficient, making the second term positive. The denominator is large and positive, because of the very large specific volume of the vapor. The value of dyjdt is consequently positive, and the pressure increases with the temperature, as is the case with the dissociation pressure of the hexahydrate. It is to be observed that this equilib-. 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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