348 



barometric pressures. Let a determination be made at the 

 barometric pressure of 740 mm. (P) and the temperature of 15° 

 (tension /"=13 mm.), then the real tension of CO^ [B) is 

 calcutated from the observed tension {& == 2.3) by means of 

 the formula 



760 



or, in the terms of the example, 



740—13 



X & 



760 ^ '■' = '-'- 



