On the Limit of the Liquid State. 



303 



T. 



TV 

 1 . 



t. 



t r . 



234 



232 5 



70 



/ 



232 



232 



78 



17*7 



77 



231 



231 



79 



*7n 



/9 



230 



229 



77 



OA 



80 



231*5 



230* 5 



75 



80 



non . f 



232 5 



noo 



262 



82 



OA 



80 



233 



231 



oo 

 83 



oo 

 82 



non 



262 



no i . K 



231 5 



84 



oo 

 83 



232 



noi .o 



231 8 



oi 



81 



OA. 



80 



noil . t 



232 5 



232 



85 



8b 



233 



non . f 



232 5 



80 



OA 



80 



231 



noi . c 



231 5 



on 



80 



Ol 



81 



231 '5 



noi 



231 



•7A 



79 



*7Q 



78 



229 *5 



230 '5 



75 



80 



231 *5 



232 



78 



80 



232 



231 



75 



74 



232 -5 



232 -5 



78 



78 



r. 







t . 



t . 



m n 



212 



5 



in,* 



124 



T A . f 



14 5 



T r 



15 



oi o 

 213 





T O K 



125 



T C* 



lb 



lb 5 



OI T 



211 





T OA • K 

 120 



t a 

 lb 



t a 

 lb 



OT A 



210 



5 



T OA 

 120 



T K • K 



15 5 



T K . K 



15 5 



m t 



211 



8 



TOT 

 121 



T f • f 



15 5 



T a 



lb 



OI 1 



211 



7 



T OT 

 121 



T K . C 



15 5 



t a 

 lb 



OI T 



211 



• O 



o 



TOO 



123 



T 



lb 



T K 



15 



OI o 



212 



1 



TOO 



123 



t a 

 lb 



t a 

 lb 



OI o 



212 



•A 



T OO .Q 



122 o 



T £ 



lb 



t a 

 lb 



OI o 

 212 



•O 



2 



T OO 



126 



15 5 



lb 5 



OI 1 



211 



• Q 



O 



T OO 



122 



T K • K 



15 5 



T Y • C 



15 5 



OI o 



212 



. K 

 



T OO .A 



122 9 



t b 



17 



17 5 



m n 



212 



b 



TOO . f 



123 5 



t n 



19 



T O 



18 



212 



•2 



123 



15 5 



15 



211 





121 



15 



15 



212 



•2 



122 -8 



16 



15 



212 



•5 



123 -9 



18 



17 



Portion of thermometer exposed, 80° to 232°. 

 Average T 231 88 | Q orrec t e d mean temperature 235°'39. 



Height of mercury in manometers over experimental tube — 



Average P 21192 j Correoted mean re J 6675 j ^ aW 



P 122-48 J 1 66'82 J 



Probable error of mean temperature 0°*10. 

 ,, ,, pressure 0*06. 



We see from the foregoing tables that the mean of over a hundred 

 experiments gives a critical point for alcohol of 235° *4 7 under a 

 pressure of 67"07 atmospheres. The reason why so many experiments 

 were done was because the first two or three series did not agree well, 

 and it was only after some experience was gained at the work that 

 good results were obtained. I ha^e no doubt that by further refining 

 of the methods better results would be obtained, but I do not think 

 the above numbers would require material alteration. Having now 

 fixed the critical temperature and pressure of alcohol under its own 

 vapour, the next work consisted in determining the critical tempera- 

 ture of the same liquid under greater pressure. When any greater 

 pressure than the critical is used, the tube is filled with a homogeneous 

 fluid, the two states of a fluid being impossible under such a pressure. 

 The critical state cannot, the: ? ore, be observed under such conditions, 

 as all the phenomena by which the liquid state can be recognised are 

 dependent upon the observation of a limiting surface having a certain 



t 2 



