Variation in the Pressure of Saturated Vapours. 



to 70°, 75°, and 80° for x. We have 



# = 3*355, 



2 



75 



c-ci -=3-335 x 



119-5 



= 0-05615. 



According to Eegnault c = 0*23894, and according to 

 Wiedemann ^sp'1441, hence c — q = 0*0948. If we as- 

 sume that c = 0*23894 and c — Ci=0'05615, we find that 

 Ci = 0*18279 instead of the value found hy Wiedemann; both 

 figures, taking calorimetric errors into consideration, may be 

 counted as very similar. Furthermore we find 



y = 3633'l, 



r = 3633*1 Xjj^ 

 According to Eegnault r 15 = 59*602. 

 2nd Method. 



= 60*805. 



t. 



P- 



dp 

 di' 



t. 



p. 



dp 



di' 



o 



60 



75544 



889-72 



1042-11 



1214-20 



32-394 

 36492 



o 



80 



85 



90 



1407-64 

 1624-10 



1865-22 



40-935 



65 



70 



75 





t 70° 75° 80° 



r 61-207 60916 60*648 



0-291 0-268 



c-c x 0-058 0-054 



The mean of c — e x = 0*056, r =ti0'916. The same values 

 are given above. 



t. 



Pressures. 



t. 



Pressures. 



o 



20 



162-31 

 53606 

 1042-4 

 1407-2 



160-47 

 53505 

 1042-1 

 1407-6 



o 



100 



2425-2 

 4876-7 

 9554-0 



2428-5 

 4885-1 

 9527-8 



50 



130 



70 



165 



80 







