TABLE 157.— HEAT CAPACITY OF GASES AND VAPORS** 



Part 1 



163 



Density 

 g/liter 



Gases (normal) 



Air 1.2920 1.004 



Ammonia 7598 2.06 



Argon* 1.782 .521 



Bromine 7.1308 .225 



Carbon dioxide 1.9630 .82 



Carbon monoxide .... 1.2492 1.04 



Chlorine 3.1638 .497 



Fluorine 1.6954 .774 



Helium* 1785 5.2 



Hydrogen* H 045 20.6 



H 2 0899 14.23 



Hydrogen bromide . . . 3.6104 .363 



Hydrogen chloride 1.6269 .795 



Hydrogen fluoride 8926 1.431 



Hydrogen iodide 5.7075 .234 



Hydrogen sulfide 1.5203 1.025 



Iodine 11.3250 .15 



Krypton* 3.7365 .25 



Mercury* Hg 8.9501 .104 



Hg 2 17.9003 .094 



Neon * 9005 1.03 



Nitric oxide 1.3388 1.00 



Nitrogen 1.2499 1.037 



Nitrous oxide 1.9638 .85 



Oxygen 1.4277 .916 



Phosphorus pentaoxide. 6.3371 — 



Potassium* K 1.744 .532 



K 2 3.4889 .482 



Sodium* Na 1.026 .904 



Na 2 2.052 .82 



Sulfur 2.8607 .565 



Sulfur dioxide 2.858 .61 



Water — 1.847 



Xenon* 5.8579 .158 



Heat capacity, 

 C p in J/g 



Temperature °C 



Constants in 

 C p = a + bT — cT-2 



J/g 



Temperature = 



° absolute 



400 



1.057 

 2.74 

 .521 

 .232 

 1.12 

 1.103 

 .511 

 .818 

 5.2 

 20.6 

 14.87 

 .381 

 .834 

 1.50 

 .245 

 1.21 

 .15 

 .25 

 .104 

 .094 

 1.03 

 1.047 

 1.08 

 .954 

 1.025 

 1.084 

 .532 

 .482 

 .904 

 .82 

 .573 

 .79 

 2.052 

 .158 



1200 



1.16 

 3.86 

 .521 

 .236 

 1.32 

 1.245 

 .537 

 .906 

 5.2 

 20.6 

 16.14 

 .416 

 .911 

 1.634 

 .266 

 1.527 

 .15 

 .25 

 .104 

 .094 

 1.03 

 1.142 

 1.21 

 1.162 

 1.143 

 1.084 

 .532 

 .482 

 .904 

 .82 

 .589 

 .875 

 2.478 

 .158 



.968 



1.822 

 .521 

 .223 

 .894 

 .980 

 .488 

 .744 



5.2 

 20.6 

 13.796 

 .352 

 .769 



1.384 

 .227 

 .962 

 .15 

 .25 

 .104 

 .094 



1.03 

 .968 

 .962 

 .779 

 .944 



1.084 

 .532 

 .482 

 .904 

 .82 

 .56 

 .762 



1.69 

 .158 



10 3 i> 



.132 



1.395 





 .01 

 .7 

 .18 

 .033 

 .11 











1.59 

 .434 

 .096 

 .169 

 .027 

 .385 





















 .118 

 .167 

 .26 

 .136 





















 .0196 

 .082 

 .535 







10- 5 c 







.1102 

 

 



.197 

 

 

 

 

 

 

 

 

 

 



.0314 

 

 

 

 

 

 



-.021 

 



.0486 

 

 

 

 

 

 



.132 

 -.008 

 



Tem- 

 pera- 

 ture 

 range 

 °C 



0-2000 

 0-1500 

 0- 



0-1400 

 0-2000 

 0-2000 

 0-1700 

 0-2700 

 0- 

 0- 



0-2000 

 0-1700 

 0-1700 

 0-1700 

 0-1700 

 0-1500 

 0- 

 0- 

 0- 

 0- 

 0- 



0-2000 

 0-1500 

 0-2000 

 0-2000 

 360-1100 

 0- 



0-1700 

 0- 

 0- 

 30-2000 

 0-2000 

 0-2000 

 0- 



** For reference, see footnote 45, p. 136. 



* The heat capacity of an ideal monatomic gas (at constant pressure) is equal to (5/2)/?. 



(continued) 



SMITHSONIAN PHYSICAL TABLES 



