Thermo-volumetric relationship

Another issue to consider is the thermo-volumetric relationship of the solution. Table 7.7 shows the relationship between temperature and volume of a sodium carbonate solution under controlled experimental conditions. The coefficient of volirme expansion for liqtrids is the ratio of the change in voliune per degree to the... 

A similar method to determine the thermo-volumetric relationship of solutions involves the nse of a pyknometer, glassware designed for the measurement of density. The cap of the pyknometer inclndes a capillary which allows the hqnid to expand. The liquid can be heated up and then the glass cap including the excess solution is dried. The pyknometer is then weighed. The difference in weight of samples provides a means of determining the volumetric expansion of the solution. 

Volumetric equations of state (EoS) are employed for the calculation offluid phase equilibrium and thermo-physical properties required in the design of processes involving non-ideal fluid mixtures in the oil, gas and chemical industries. Mathematically, a volumetric EoS expresses the relationship among pressure, volume, temperature, and composition for a fluid mixture. The next equation gives the Peng-Robinson equation of state, which is perhaps the most widely used EoS in industrial practice (Peng and Robinson, 1976). 

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