284 PHENOMENA, ATOMS, AND MOLECULES 



the usefulness of the conception of separate surface energies for each of 

 the different parts of complex molecules. It is believed that this viewpoint 

 is applicable to the study of nearly all the physical properties of organic 

 compounds, particularly to the calculation of the vapor pressures, solu- 

 bilities, viscosities, and surface tensions of liquids and their mixtures. 



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