90 



VISCOSITY OF GASES 



237 



formula with these values agree with the observed values is 

 shown by the following table : 



Carbonic Acid. 



I then calculated the same observations by the formula 



77 = 



on the assumption that a and b are independent of the 

 pressure p. This formula, as has been mentioned, would 

 not apply to the temperature 25 -1; for the other tempera- 

 tures, on the contrary, I found 



9- = -6 

 35 

 40-3 



a = 0-01332 

 1374 

 1142 



b = 0-0001734 

 1859 

 1665 



