This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...the transition-temperature lies between 95 and 96. Prob. 9. Suggest an explanation of the catalytic action of the solvent in accelerating the transition of the sulphur. Prob. 10. Outline a method by which the transition-temperature of sulphur could be determined by quantitative solubility measurements. THE ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...the transition-temperature lies between 95 and 96. Prob. 9. Suggest an explanation of the catalytic action of the solvent in accelerating the transition of the sulphur. Prob. 10. Outline a method by which the transition-temperature of sulphur could be determined by quantitative solubility measurements. THE PHASE RULE 97. Concept of Variance. Prob. 11. If sulphur is kept at a specified pressure of 0.04 mm., at what temperatures is it stable, o, in a single phase as rhombic sulphur, as monoclinic sulphur, and as liquid sulphur? 6, in two phases, as rhombic and monoclinic sulphur, and as monoclinic and liquid sulphur? c, in the three phases, rhombic sulphur, monoclinic sulphur, and sulphur-vapor? It will be noted that, in order to determine the position on the diagram and therefore the state of the system, the values of two determining factors, namely, the values of both the pressure and the temperature, must be specified when there is only one phase; that the value of only one of these factors, either the temperature or pressure, need be specified when any two phases coexist; and that no condition can be arbitrarily specified when any three phases coexist. The number of determining factors whose values can and must be specified in order to determine the state of a system consisting of definite phases and components is called its variance; and, corresponding to the number of such factors, systems are said to be nonvariant, univariant, hivariant, etc. It is evident from the preceding statements that when a onecomponent system consists of only one phase the system is bivariant, when it consists of two phases it is univariant, and when it consists of three phases it is nonvariant. In other words, the sum of the variance and number of phases is always...
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