By D. H. Whiffen (Auth.)
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Extra resources for Manual of Symbols and Terminology for Physicochemical Quantities and Units
Thus z = Z/LCACB- 33 34 COMMISSION ON SYMBOLS, TERMINOLOGY, AND UNITS 12. VALUES OF SOME FUNDAMENTAL CONSTANTS At its General Assembly in Stockholm on September 11,1973, the Committee on Data for Science and Technology (CODATA) of the International Council of Scientific Unions recommended a revised set of consistent values of the fundamental constants for international use. 12). For convenience, selected constants most useful for chemists are listed here, including several defined constants and derived constants not mentioned in the CODATA report.
I. 12 Relative activity of a solute substance in a solution The relative activity OB of a solute substance B in a solution (especially in a dilute liquid solution) containing molalities «ÎB, wie, · . , of solute substances B, C, . I 1. ) The name activity is often used instead of the name relative activity for this quantity. 3) in place of molality WB, and a standard value cQ of concentration (usually chosen to be 1 mol dm - 3 ) in place of the standard value me of molality. Another relative activity, called the rational relative activity of the solute substance B and denoted by ax,B, is sometimes used.
A. ) P-+0 where p is the pressure of the gas and T is its thermodynamic temperature. ) o where KB* is the molar volume of the pure gaseous substance B. A pure gaseous substance B is treated as an ideal gas when the approximation / B * = p is used. The ratio ( / B * / / 0 may be called the fugacity coefficient. V 38 COMMISSION ON SYMBOLS, TERMINOLOGY, AND UNITS The name activity coefficient has sometimes been used for this ratio but is not recommended. 2. Mixtures A. 4 Definition of a mixture The word mixture is used to describe a gaseous or liquid or solid phase containing more than one substance, when the substances are all treated in the same way (contrast the use of the word solution in Section A.
Manual of Symbols and Terminology for Physicochemical Quantities and Units by D. H. Whiffen (Auth.)