APPENDIX S. 



243 



pressure, and c a constant quantity depending on 

 the weight of the vapor -and on the units chosen. 

 We give here the table of the volumes occupied by 

 a gramme of vapor formed at different tempera- 

 tures,, and consequently under different pressures. 



The first two columns of this table are taken 

 from the Traite de Physique of M. Biot (vol. i., p. 

 272 and 531). The third is calculated by means 

 of the above formula, and in accordance with the 

 result of experiment, indicating that water vapor- 

 ized under atmospheric pressure occupies a space 

 1700 times as great as in the liquid state. 



By using three numbers of the first column and 

 three corresponding numbers of the third column, 

 we can easily determine the constants of our equa- 

 tion 



A + B log v 



~ A' + B' log v 



