36 i 



The table indicates clearly that the chemical equilibrium 

 is altered in such a manner that the affinity between the 

 carbonic acid and the normal carbonates becomes less , and 

 the tension consequently greater, at higher temperatures. The 

 four last experiments, cited in the table, in which waters of 

 very different tensions have been subjected to the same rise in 

 temperature, show that no proportionality exists between the 

 tension of the water at O*" and the increase caused by an 

 increased temperature. On the contrary, a certain rise in 

 temperature seems to cause an additional increase of a certain 

 amount in the tension, irrespective of the original tension of 



0,6 

 0,5 



O/f 

 0,i 



о.г 



0° 2' tf" 6° 8° /О" /2" /<f° /6" 18" 20° 22" 2^' 



Fia. 8. 



n 

 к 



the water. It does not seem probable, that this rule will hold 

 good for all tensions of carbonic acid, but it appears from the 

 table that it has rather a wide range of application, and 1 

 therefore venture to express the results of the experiments in 

 the form of the adjoined curve and table, by means of which 

 the tension of a seawater-sample, observed at a known tempera- 

 ture, may be calculated for any other temperature between the 

 limits of 0° and 24°, provided the tension at 0° is not lower 

 than 1.0 and not higher than 15. 



The table shows for every degree of temperature between 

 0° and 24° the additional increase in tension c, the coefficient 



