33 2 APPENDIX 



Comparison of Centigrade Scale with Fahrenheit: t° C.= -t + 32 F. 1 



SOME CONSTANTS CONCERNING AIE. 



Weight of one liter of air at the barometric pressure of 760 

 mm. and the temperature of o° C, 1.293 grams. Per cent., by- 

 weight, of oxygen in pure air under above conditions, 23.18^. 

 Per cent., by weight, of nitrogen (including argon) in pure air 

 under above conditions, 76.82^. Per cent, of C0 2 varying 

 quantity usually taken at 0.03-0.04$ HN0 3 and NH 3 present as 

 traces under some conditions. 



Amount of water vapor contained in saturated air at the pres- 

 sure of 760 mm. and at various temperatures. 



o°C. 4.835 20°C. 17.118 



5 6.761 25 22.796 



10 9.330 30 30.039 



15 12.712 35 39-J87 



1 Smithsonian Tables, 1897. 



