1 1 (•) DENSITIES OF OXYGEN AND HYDROGEN 



17. ATOMIC WKKiUT COMIMTKD IHOM DENSITY AND VOLUMKI'lMr HATIOS. 



The atomic weight of oxygen may also be oomputeil from the ratio of the 

 densities of hydrogen and oxygen, together uitli the ratio of the volumes in wliicli 

 the o-ases combine. The value of the density of oxygen obtained in the forty-one 

 experiments described in tlii- iiaper is : 



Density of oxygen 1.42900 gr. 



For hydrogen, by the mean of twenty-three successful experiments in the 

 third, fmrth, and fifth series, the value is: 



Density of hydrogen 089873 gr. 



These values are for the sea level in latitude -lo". In order to compare them 

 with the results of others, we may i-educe to the values corresponding to the force 

 of gravity at Paris by multiplying by 1.000316. We then have 



Density of oxygen at Paris 1-42945 g"". 



Density of hydrogen at Paris 089901 gr. 



Lord Rayleigh has lately published a table showing the values found liy 

 various experimenters, as follows : 



Oxygen. Hydrogen. 



Regnault, 1847 1.429S0 gr. .08958 gr. 



Corrected by Crafts 143011 .08988 . 



Von Jolly, 1880 1-42939 



Ditto, corrected 1-4297 • 



Leduc, 1891 1. 42910 .08985 



Rayleigh, 1893 1-42952 .09001 



In taking the mean, he omits the uncorrected numbers and obtains: 



Density of oxygen, at Paris i. 42961 gr. 



Density of hydrogen, at Paris 08991 gr. 



Hence we obtain for the ratio : 



Ratio of densities, mean of all ])rcvious experiments 15.9005 



Ratio of densities, my own experiments 15.9002 



As to the volumetric ratio, the value obtained in this paper is : 



Ratio of volumes of oxygen and hydrogen which combine 2.C0269 



Scott has found the value 2.00285 



Leduc found, from two experiments, the value 2.0037 



