54 MM. Warburg and v. Babo on the Connexion 



Viscosity of 



liquid 



carbonic acid under the 



pressure of 





its saturated vapour. 









X = 0-0018. 





t. 





8, 



[i . 10 6 . 



o 

 5 





0-922 1 



925 



10 





0-895 



852 



15 





0-864 



784 



20 





0-827 



712 



25 





0-783 



025 



29 







539 



SO 100 Density. 



The figure gives a graphic representation of the results — 

 namely, the isotherms* of viscosity and tension, the latter in 

 dotted lines, noted according to the Table. 



Andreef's values of the pressure t exceed ours but little — 

 at 32°-6, on an average, about one atmosphere. This may 

 arise from the air-content of the carbonic acid being in 

 Andreef's experiments somewhat less than in ours. The 

 values of_p calculated by Clausius's formula, however, are not 

 inconsiderably higher than those observed by us ; the differ- 

 ences increase with the density, and reach the value of 10-12 

 atmospheres. On account of the agreement of our results 



* "We thus name lines the abscissse of which are proportional to the 

 densities, and the ordinatesto the friction-coefficients and pressures respec- 

 tively. 



t Pogg. Ann. Erg. Bd. y. p. 79. 



