Liquids in contact with Different Gases. 



VII. Turpentine. 

 ^' = •865, r= -02499, 7i' = -9566. 



411 



Gas. 



k 



9. 



h x . 1 a\ 



T (air). 



T(C0 2 ). 



T 18 (air). 



T M (C0 2 ). 



Air . 



.118-6 



o 

 18-4 



3-130 \ -03296 



27'97 





28-05 





CO,. 



.18-6 



18-6 



3-108-03263 





27-70 





27-82 



Air . 



.18-6 



18-5 



3-120 -03281 



27-84 





27-94 





CO.. 



.118-6 



18-7 



3-109 -03265 





27-71 





27-85 



Air. 



.J18-6 



186 



3-122 -03284 



27-87 





27-99 





CO.. 



.118-6 



18-8 



3-108 -03263 





27-70 





27-86 



Air. 



.18-6 



18-7 j 3-116-03275 



27-79 





2793 





CO.. 



.118-6 



18-91 3-106 -03261 





27-68 





27-86 



Air.. 



. 18-6 



18-8 3-117 -03276 



2781 





27-97 









IMea 



n T 18 (turpe 



ntine-ai 



r) =27-98 d?nes . 



' cm. 





Mean T 18 (turpcntme-C0 2 ) = 27"85-*- nes . 



v A ' cm. 



ST 



T 



= -•0040. 



The table below summarizes the results obtained 



Substance. 



Temp. 



T (air). 



T (CO,). 



ST 

 -T- 



Benzene 



o 

 17 



17 



15 



17 



18 



15 



18 



2937 

 2779 



73-88 

 23-33 

 2312 



17-88 

 27 : 98 



2883 

 27 - 22 

 7304 

 22-97 

 22-84 

 1765 

 2785 



-•0184 

 -0205 

 -•0114 

 -•0154 

 -•0121 

 -•0129 

 -•0046 



Chloroform 



Water 



Methyl-alcohol... 

 Ethyl-alcohol ... 

 Ether 



Turpentine 



Although it is of the nature of a side-issue, an interesting 

 result may be deduced from the figure given above for the 

 surface-tension between turpentine and air. The usual value 

 given for this constant as deduced from capillary-rise ex- 

 periments is about 2()*7 dynes per centimetre at 18° C. If 

 it be assumed that this value is really T cos 0, where 6 is the 

 angle of contact of turpentine with glass we have at once, 



a 2G * 7 



•9541, 



whence #=17 0, 5 approximately, in very close agreement 

 with the value (17°), given by Magie * as the result of 

 measurements of the total depth of a large bubble of air 

 imprisoned in the liquid under a convex lens. 

 * Phil. Mag-. August 1688, p. 102 . 



