APPENDIX 



333 



EXPANSION OF AIR AT DIFFERENT TEMPERATURES 

 In dealing with enclosed volumes of air at varying tempera- 

 tures it is convenient to have some idea of the resulting change 

 of volume. The table below is based on the quantity i + 00367^ 

 when the pressure is constant and with dry air. The volume of 

 air at o° being unity, its expansion per degree is shown. In 

 using such a table without regard to changes of atmospheric 

 pressure, or variation of water vapor in the air, it must be remem- 

 bered that the results are not without error. For proper correc- 

 tions to be made for these sources of error, any work on gas 

 analysis may be consulted, but by far the greatest change in 

 volume is due to the expansion of the air itself, without regard to 

 ordinary changes of atmospheric pressure, or to moisture. 



Relative Value of i Part of Air at Various Temperatures. 



DENSITY OF OXYGEN (0 2 ).> 

 Weight of 1 cc. of oxygen in milligrams at 760 mm. baro- 

 metric pressure, and from io -2 5" C temperature. 



1 Adapted from Chemiker Kalendar. 1893, R Fiedermann. 



