Laics of Molecular Force. 

 Table XII. (continued) .—Ethyl Alcohol. 



225 



V. 



R»/(«). 



v 2 <p(v). 



v. 



B^*). 



v 2 <p(v). 



Perfect gas. 



1-35 





8 



343 



11300 



10S-2 



1-65 



18000 



6 



334 



8600 



534 



1-83 



15000 



4 



3-37 



6200 



30 



2-16 



15000 



3 



351 



5000 



261 



231 



16000 



2-4 



3-03 



4600 



18-2 



2-83 



17000 



2 



4-87 



4700 



12 



332 



15000 



1-8 



5-83 



4900 



10 



341 



13500 



16 



700 



4900 



9 



3-43 



12500 



1-4 



8-81 



4700 



The numbers for methyl alcohol do not extend as far as the 

 critical volume, while those for ethyl alcohol go considerably 

 beyond it, lying as it does between 3 and 4 ; but we notice 

 in both cases that Hvf(v) increases from the limiting gaseous 

 value, but attains a practically constant value before the 

 critical volume is reached. In ethyl alcohol we may say that 

 the value 3*4 is retained from volume 10 to volume 3, and 

 moreover this 3*4 is not now double the initial 1*35, but about 

 2*5 times it. In methyl alcohol the value 4*5 may be said to 

 be retained constant from A^olume 11 to 7, the lowest on the 

 table ; so that it is probable that, as in the case of ethyl alcohol, 

 this value will be retained down to the critical volume : here 

 again, also, the 4*5 is more than double the initial 1*95, but is 

 only 2*3, not 2*5, times it. 



Note that, in ethyl alcohol, as soon as the critical volume is 

 passed TLvf(v) begins again to increase rapidly, just as 

 happened in the case of ethyl oxide. But for our present 

 purpose more interest attaches to the course of v q (f)(v). In 

 methyl alcohol at high volumes it seems to approach a limit 

 which we may assign as 46,000, and then at volume 16, 

 where Hvf(v) has risen to double its initial value, v^cp^v) has 

 fallen to almost half of 46,000, but as H^/(v) continues to rise 

 ^ 2 </>(v) continues to fall, and still continues to do so even when 

 ~Rvf(y) has become constant. In methyl alcohol we cannot 

 follow the changes right down to the critical volume, but in 

 ethyl alcohol we see that v 2 <j>(v) attains at the critical volume 

 a value which is carried constant into the liquid state, this 

 constant value being about one quarter of the apparent limiting 

 value 20,000 at large volumes. The constancy of v 2 (f)(v) below 

 the critical volume is in striking contrast to the rapid variation 

 of R,vf(v). 



I have not sought to represent by formulas the course oi' 

 the two functions for the alcohols, as I have doubts about 



