276 



TABLE 259.— CRITICAL TEMPERATURES, PRESSURES, AND DENSITIES 



OF GASES** 



Critical Critical Critical 



temperature pressure density 



Substance (0°C) (kg/cm*) (g/cm 3 ) 



Acetylene 36 62 .231 



Air —140.7 37.2 .35* .31f 



Alcohol (CaHeO) 243.1 63.1 .2755 



Alcohol (CH<0) 240.0 78.7 .272 



Allylene 128 



Ammonia 132.4 115.5 .235 



Argon —122 49.7 .531 



Benzene 288.5 47.7 .304 



Bromine 302 ... 1.18 



iso-Butane 134 37 



n-Butane 153 36 



Carbon dioxide 31.1 75.5 .46 



Carbon disulfide 273 76 



Carbon monoxide — 139 36.2 .311 



Chlorine 144.0 78.7 .573 



Chloroform 263 ... .516 



Cyanogen 128 59 



Ethane 32.1 48.8 .21? 



Ether (ethyl) 193.8 35.5 .2625 



Ethyl chloride 187.2 52 .33 



Ethylene 9.7 50.9 .2159 



Helium —267.9 2.34 .0693 



Hydrogen —239.9 13.2 .0310 



Hydrogen bromide 90 84 



Hydrogen chloride 51.4 84.5 .42 



Hydrogen iodide 151 82 



Hydrogen sulfide 100.4 92 



Iodine 553 ... ... 



Krypton -63? 56? .78? 



Mercury 1460±20 1640+50 .5 



Methane —82.5 47.4 .162 



Methyl chloride 143.1 65.8 .37? 



Neon —228.7 26.8 .484 



Nitric oxide —94? 65 .52? 



Nitrogen -147.1 34.7 .3110 



Nitrous oxide 36.5 71.7 .45? 



Oxygen —118.8 51.4 .430 



Phosgene 182 56 .52 



Propane 95.6 43 



Radon 104 64.1 



Silicon hydride — 3.5 49.7 



Sulfur 1040 



Sulfur dioxide 157.2 80.1 .52? 



Sulfur trioxide 218.3 86.5 .630 



Water 374.0 224.9 .4 



Xenon 16.6 60.2 1.155 



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

 * Plait point. t Critical point of contact. 



SMITHSONIAN PHYSICAL TABLES 



