DILATATION OF THE GASES. 



Oxigen gas obtained from oxigenated muriate of pofafh was 

 dilated three times, and gave the following refults. 



263 



— oxigen f 



100 parts became 



f 137,47 

 i 137,54 

 t 137,45 



The mean reful t of which is - 137,48 



Azote gas obtained from the decompofition of ammonia by 

 oxigenated muriatic acid gave the following mean refults. 



137.42 - 



«~azote. 



100 parts became 



The mean refult is 



137,56 

 137,50 

 137,46 

 137,55 



137,49 



By connecting the preceding refults, and by comparing the Tabulated re- 

 dilatation of oxigen, hidrogen, and azote gafes with that O f fu ^ so ^ f o u r 



/• t • • t • i c ii ,, gafes mew the 



atmolpheric air, we obtain the following table : fame expanfion 



The trifling differences obferved in the preceding refults 

 may proceed from the impoffibility of rendering the circum- 

 ftances rigoroufly the fame in each experiment ; and as they 

 extend to only two ten thoufandth parts of the original volume, 

 it may be concluded with fafety, that the dilatation of atmof- 

 pheric air, oxigen, hidrogen, and azofe gafes are the fame 

 from the temperature of melting ice to that of boiling water. 



In order fo determine the dilatation of gafes foluble in wa- 

 ter I changed the apparatus, I ufed two tubes graduated at 

 the fame time on the fame bath of mercury with a very fmall 

 meafure. Every time I ufed this apparatus, I took the pre- 

 caution that the quantity of mercury fhould be the fame as 

 when the tubes were graduated. I mult even obferve, that if 

 any accident happens to the velTel containing the mercury, the 

 tubes mult be again graduated on another bath. It would 

 4 even 



Apparatus for 

 gafes fuiuble in 

 water. They 

 were compared 

 by expofure to 

 heat over mer- 

 cury in a tube, 

 while atmofphe- 

 ric airwr.s fimi- 

 larly treated. 



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