BRIDGAIAN. — WATER UNDER PRESSURE. 



547 



according as its structure is more or less compressible. Thus liquid 

 water is more compressible than ice I, although it has the smaller 

 volume and is composed of molecules which are themselves less 

 compressible. 



TABLE XXXII, 



The Volume of Water Calculated by Tumurz's Formula Compared 



WITH Experiments. 



With regard to the bearing of these data on the theory of liquids, 

 the theory itself does not seem to be at present far enough advanced 

 so that these data can settle definitely any crucial questions. In fact, 

 there do not seem to be any clear cut questions waiting for settlement. 

 Nearly all the work done so far on liquids has been in modifying van 

 der Waals' equation by making assumptions which seem more or less 

 plausible about the way in which the forces between the molecules, 

 the distances between the molecules, or the energy of the molecules 

 vary with the temperature and pressure, and the chief aim of all this 

 activity seems to have been the production of an equation with as few 



