269 



TABLE 254.— PROPERTIES OF MOLECULAR HYDROGEN (concluded) 

 Part 3. — Values of R for hydrogen for temperatures in °K 



TABLE 255.— DENSITY OF GASES AND VAPORS** 



The following table gives the density as the weight in grams of a liter (normal liter) of the 

 gas at a °C, 76 cmHg pressure, also the weight in lb/ft 3 , and standard gravity 930.655 cm/sec 2 

 (sea level, 45° latitude), the specific gravity referred to dry, carbon-dioxide-free air, and to pure 

 oxygen. Dry, carbon-dioxide-free air is of remarkably uniform density ; Guye, Kovacs, and 

 Wourtzel found maximum variations in the density of only 7 to 8 parts in 10,000. For highest 

 accuracy pure oxygen should be used as the standard gas for specific gravities. Observed densities 

 are closely proportional to the molecular weights. 



Gas Formula 



Acetylene C2H2 



Air — 



Ammonia NH 3 



Argon A 



Arsene AsH 3 



Butane-iso GHm 



Butane-n C4H, 



Carbon dioxide CO a 



Carbon monoxide CO 



Carbon oxysulfide COS 



Chlorine CU 



Chlorine monoxide .... Cl a O 



Ethane G»Ho 



Ethylene CaH 4 



Fluorine F 2 



Helium He 



Hydrogen H 2 



Hydrogen bromide HBr 



Hydrogen chloride HC1 



Hydrogen iodide HI 



Hydrogen selenide HaSe 



Hydrogen sulfide H 2 S 



Krypton Kr 



Methane CH, 



Methyl chloride CH 3 C1 



Methyl ether (CH S 3),0 



Methyl fluoride CH,F 



Mono methylamine CH 3 NH a 



Neon Ne 



Nitric oxide NO 



Nitrogen (chem.) N 3 



Nitrogen (atm) 



Nitrosyl chloride NOC1 



Nitrous oxide N a O 



Oxygen O a 



Phosphine PH 3 



Propane GHs 



Silicon tetrafluoride . . . SiF 4 



Sulfur dioxide SO2 



Xenon Xe 



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

 * At 710 mmHg. 



SMITHSONIAN PHYSICAL TABLES 



