SPECIFIC HEAT. 



TABLES 22 229. 



TABLE 228. Specific Heat of Water. 



TABLE 229. - Specific Heat of Air. 



The ratio of the specific heat at constant pressure to the specific heat at constant volume has been the subject of much 

 investigation, and more particularly so in the case of atmospheric air, on account of its interest in connection with 

 the velocity of sound. The following table gives the results of the principal direct determinations of this ratio for 

 air. It may be remarked that the methods most commonly employed have been modifications of that employed by 

 Clement and Desormes, and that the chances of error towards too small a ratio by this method are considerable. 



* Variation assumed uniform below 7 with same slope as from 7 to 5. 

 NOTE. For specific heats of metals, solids and liquids, see pp. 294 to 296. 



SMITHSONIAN TABLES. 



223 



