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The molecular weight is a basic quantity needed in many kinds of projects involving the materials that are the subject of this symposium. It is needed to convert weight fractions to mole fractions, which occur in thermodynamic expressions which one uses in the design, evaluation and operation of all kinds of separation equipment and processes. In the examination of natural as well as manufactured oil mixtures, it may be desirable to characterize them by means of a hydrocarbon type analysis, which often requires the direct knowledge of molecular weight. Development of the methods for measuring molecular weight has paralleled the remarkable progress of science during the past decades. These methods are often grouped according to the averaging procedures involved. If a method gives the average of the molecular weights of the individual mole fraction,
Stross, F. H.
Shell Development Co., Emeryville, Calif.