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1. Activity coefficient Number expressing the ratio of a substance's chemical activity to its molar concentration.

2. The relationships between activity and activity coefficient of CaO on the one hand and both concentrations of titanium oxide and magnesium oxide on the other have been discussed.

3. A computer method for calculating the activity coefficient withUNIFAC model is described in details.

4. Activity coefficient is an important parameter in aqueous speciation models, and plays an important role in describing the mass transfer between water and rock quantitatively.

5. The author reviews the activity coefficient formula employed by some famous international speciation calculation programs and compares their advantages, disadvantages and their valid range.

6. An equation for the activity coefficient expressed by solubility parameters and taking excess entropy into consideration is presented in the payer.

7. But the way of activity coefficient which can forecast Equilibrium under some conditions was adopted.

8. Measurement method of activity coefficient of Associated and non - associated electrolyte solution was discussed.

9. Three activity coefficient equations, such as Wilson, NRTL and UNIQUAC, were used to show the deviation from ideal behavior in liquid phase.

10. The choice of activity coefficient models, methods of correlation and prediction of ternary LLE data and the influence of the temperature on LLE have been discussed and explored.

11. How to estimate the activity coefficient of a chemical species is a problem which we must deal with carefully.

12. In this article is described the arrangement of a set of fairly simple apparatus for the determination of the osmotic coefficient as well as the activity coefficient on the isopiestic principle.

13. In this paper, the merits-and-flaws and the development status of equation of state model and activity coefficient model in solving the process of phase equilibria are introduced at first.

14. The finite diffusion model of CME was established, the activity coefficient ratio, the diffusion coefficient correction factor and the kinetic parameter were introduced and evaluated.

15. Model UNIFAC is one of the most widely used model in reckoning the component activity coefficient in nonelectrolyte solution. It is also used in engineering designing calculation.

16. At the same time the difference of the solubility to the isomeric compound Anthracene and Phenanthrene in the different solvents is discussed by the aspect of the activity coefficient.

17. Basde on the theoretical analysis Iinferred the three main factors:the Activity Coefficient of lead on liquid copper, Lead activity, the reaction equilibrium constants.

18. The possibility of unique azeotropy or polyazeotropy in a liquid mixture can be predicted using activity coefficient models in terms of boiling point calculation.

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19. In chapter five, the students will learn about some properties of the constituent element in polycomponent system, such as partial molar quantity, fugacity coefficient, activity coefficient.

20. This method is as rigorous in theory as that based on the equation of state, and as simple in computation as the activity coefficient method.

21. In this paper, the evaporation loss rate of Ti and Al in TiAl alloy melt was calculated with the aid of activity coefficient of Ti, Al.

22. Generally speaking, a new and simple way of predicting the infinite dilution activity coefficient was suggested in this paper.

23. In conolusion, a variety of data measurements, data collection and compilation are vital to theoretically sound activity coefficient models at present even in the future.