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Physical Properties

 

 

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Gas Density (NTP) Boiling Point Critical Press Critical
Temperature
Mole
Weight
Specific 
Volume
Specific
Gravity
Chemical Formula 2008 TLV Flammable Range Odor IDLH ppm

 

Name Gas Density (NTP) Boiling Point Critical Press Critical
Temperature
Mole
Weight
Specific 
Volume
Specific
Gravity
lb/ft3 kg/m3 °F °C psia bar °F °C - ft3/# m3/kg (air=1)
Acetylene  0.0733 a 1.17 a -119.2 -84 897.8 63.1 95.36 35.2 26.04 14.43 0.901 0.908
Air 0.0807 a 1.29 a -317.8 -194.4 547.4 38.5 -221.08 -140.6 28.85 13.3 0.83 1
Ammonia 0.045 0.72 -28.1 -33.4 1636.1 115 270.32 132.4 17.03 22.6 1.411 0.597
Argon 0.1034 1.66 -302.6 -189.4 705.4 49.6 -188.32 -122.4 39.95 9.67 0.604 1.378
Arsine  0.2 3.2 -80.5 -62.5 957 67.3 211.82 99.9 77.95 5 0.312 2.69
Boron Trichloride  0.303 4.85 54.3 12.4 561.4 39.5 353.84 178.8 117.17 3.3 0.206 4.03
Boron Trifluoride 0.1777 2.85 -147.6 -99.8 723 50.8 10.04 -12.2 67.81 5.6 0.35 2.387
Butadiene, 1, 3-  0.1516 a 2.43 a 24.1 -4.4 627.5 44.1 305.6 152 54.09 6.9 0.431 1.878
Butane, 3- 0.1588 2.54 31.1 -0.5 550.7 38.7 305.6 152 58.12 6.4 0.4 2.11
Butene, 1- 0.1477 b 2.37 b 20.7 -6.3 583.4 41 295.52 146.4 56.12 6.7 0.418 1.997
Carbon Dioxide 0.1140 a 1.83 a -109.1 -78.4 1070.6 75.3 87.8 31 44.01 8.76 0.5471 1.522
Carbon Monoxide 0.0781 a 1.25 a -312.7 -191.5 507.4 35.7 -220.36 -140.2 28.01 13.8 0.862 0.967
Chlorine 0.1859 2.98 -29.3 -34.1 1118.4 78.6 291.2 144 70.91 5.4 0.337 2.49
Deuterium 0.0112 0.18 -417.1 -249.5 239.2 16.8 -390.82 -234.9 4.03 95.9 5.987 0.1497
Dichlorosilane  0.2601 4.17 46.8 8.2 678.2 47.7 348.8 176 101.01 3.83 0.239 3.52
Disilane  0.179 2.87 6.3 -14.3 747.2 52.5 303.53 150.85 62.22 6.21 0.388 2.38
Ethane  0.0775 b 1.24 b -127.5 -88.6 712.8 50.1 90.32 32.4 30.07 12.8 0.799 1.048
Ethylene  0.0787 a 1.26 a -154.7 -103.7 742.1 52.2 49.82 9.9 28.05 13.8 0.862 0.975
Halocarbon 14 0.228 3.65 -198.3 -127.9 542.4 38.1 -49.9 -45.5 88 4.39 0.274 3.038
Halocarbon 22  0.2335 3.74 -41 -41 721.9 50.8 204.8 96 86.47 4.4 0.275 3.11
Halocarbon 23  0.182 2.92 -115.6 -82 697 49 78.26 25.7 70.01 5.5 0.343 2.2636
Halocarbon 116  0.3608 5.78 -108.8 -78.2 432 30.4 67.5 24.3 138.01 2.8 0.175 4.773
Halocarbon 134A  0.4683 b 7.50 b -15.7 -26.5 589.6 41.5 213.98 101.1 102.03 2.14 0.134 -
Halocarbon 218  0.5 8.01 -34.1 -36.7 388.7 27.3 161.42 71.9 188.02 2.02 0.126 6.69
Halocarbon C318 0.55 8.82 21.56 -5.8 403.3 27.8 238.6 114.8 200.03 1.85 0.12 7.33
Helium 0.0103 0.16 -452.1 -268.9 33.2 2.3 -450.4 -268 4 96.6 6.031 0.138
Hexane, -n 0.2228 3.569 155.66 68.7 430.6 29.7 453.6 234.2 86.18 4.996 0.31 0.66
Hydrogen 0.005 0.08 -423 -252.8 188.1 13.2 -399.82 -239.9 2.02 191.7 11.968 0.0696
Hydrogen Bromide 0.208 3.33 -88.1 -66.7 1234.5 86.8 193.64 89.8 80.92 4.8 0.3 2.77
Hydrogen Chloride 0.0943 1.51 -121 85 1197.7 82.5 124.5 51.4 36.46 10.6 0.66 1.27
Hydrogen Sulfide 0.089 1.43 -76.5 -60.3 1306.5 91.9 212.72 100.4 34.08 11.23 0.701 1.189
Isobutane  0.1553 2.49 10.9 -11.7 529.1 37.2 275 135 58.13 6.5 0.406 2.064
Isobutylene 0.1440 b 2.31 b 19.6 -6.9 580.2 40.8 292.46 144.7 56.12 6.7 0.418 1.947
Krypton 0.217 3.48 -244.1 -153.4 796.5 56 -82.84 -63.8 83.8 4.61 0.288 2.899
Methane 0.0448 a 0.72 a -258.7 -161.5 673.1 47.3 -115.78 -82.1 16.04 23.7 1.48 0.555
Methyl Chloride  0.1319 b 2.11 b -11.6 -24.2 2438.1 171.4 289.58 143.1 50.49 7.6 0.474 1.784
Neon 0.052 0.83 -411 -246.1 394.7 27.8 -379.66 -228.7 20.18 19.21 1.199 0.696
Nitric Oxide 0.0767 b 1.23 b -241.2 -151.8 949.4 66.7 -135.22 -92.9 30.01 13 0.812 1.036
Nitrogen 0.0725 1.16 -320.4 -195.8 492.2 34.6 -237.82 -149.9 28.01 13.8 0.862 0.967
Nitrogen Dioxide  0.2119 3.39 70.2 21.2 1469.6 103.3 316.76 158.2 46.01 4.7 0.293 2.62
Nitrogen Trifluoride  0.186 2.98 -200.2 -129 657.2 46.2 -38.74 -39.3 71 5.4 0.337 2.46
Nitrous Oxide  0.115 1.84 -127.3 -88.5 1052.2 74 97.52 36.4 44.01 8.7 0.543 1.53
Oxygen 0.0828 1.33 -297.4 -183 731.4 51.4 -181.48 -118.6 32 12.1 0.755 1.105
Pentane  0.1866 2.988 96.93 36.07 488.63 33.69 385.7 196.5 72.15 5.4 0.337 2.491
Phosphine  0.0875 1.4 -125.9 -87.7 947.9 66.6 124.88 51.6 34 11.4 0.712 1.184
Propane  0.1166 1.87 -43.8 -42.1 618.7 43.5 206.24 96.8 44.11 8.5 0.531 1.55
Propylene  0.1114 1.79 -53.9 -47.7 667.1 46.9 197.24 91.8 42.08 9.06 0.566 1.48
Silane  0.0837 1.34 -168.7 -111.5 702.5 49.4 25.88 -3.4 32.12 12.04 0.752 1.114
Silicon Tetrachloride  0.442 7.08 135.7 57.6 573.3 40.3 454.82 234.9 169.9 2.28 0.142 5.8
Sulfur Dioxide  0.1666 2.67 14 -10 1143.5 80.4 315.68 157.6 64.06 5.9 0.368 2.263
Sulfur Hexafluoride  0.3845 6.16 -82.8 -63.8 545.2 38.3 113.9 45.5 146.05 2.5 0.156 5.11
Trichlorosilane  0.3500 b 5.61 b 89.6 32 597.3 42 402.08 205.6 135.45 2.85 0.178 4.7
Tungsten Hexafluoride  0.793 12.7 67.1 19.5 629.5 44.3 339.44 170.8 297.84 1.24 0.077 10.8
Xenon 0.342 5.48 -162.6 -108.1 846.7 59.5 61.88 16.6 131.3 2.9 0.181 4.56

 

Name Chemical Formula 2008 TLV Flammable Range Odor IDLH ppm
ppm mg/m3 LEL air UEL air
Acetylene C2H2 Simple Asphyxiant 2.5 100 Ethereal  
Air N/A N/A N/A N/A N/A None  
Ammonia NH3 25 17 16 25 Pungent, Irritating 300
Argon Ar Simple Asphyxiant Nonflammable None  
Arsine AsH3 0.005 0.016 5.1 78 Garlic-like 3
Boron Trichloride BCl3 None Established Nonflammable Pungent, Irritating 100
Boron Trifluoride BF3 C 1.0 C 3.0 Nonflammable Pungent, Suffocating 25
Butadiene, 1,3- CH2:CHCH:CH2 2 4 2 11.5 Mildly Aromatic 2000
Butane, n- C4H10 1000 2377 1.9 8.5 Natural Gas-like  
Butene, 1- CH3CH2CH:CH2 250 574 1.6 10 Natural Gas-like  
Carbon Dioxide CO2 5000 9000 Nonflammable None 40000
Carbon Monoxide CO 25 29 12 75 None 1200
Chlorine Cl2 0.5 1 Nonflammable Pungent, Irritating 10
Deuterium D2 Simple Asphyxiant 5 75 None  
Dichlorosilane SiH2Cl2 None Established 4.7 99 Pungent, Suffocating 100
Disilane (SiH3)2 5 13 Unknown, Pyrophoric Repulsive, Choking  
Ethane C2H6 1000 1230 1000 1230 None  
Ethylene CH2:CH2 200 229 2.7 36 Sweet  
Halocarbon-14 CF4 None Established Nonflammable None  
Halocarbon-22 CHClF2 1000 3537 Nonflammable Nearly Odorless  
Halocarbon-23 CHF3 None Established Nonflammable None  
Halocarbon-116 C2F6 None Established Nonflammable None  
Halocarbon-134A CF3CH2F None Established Nonflammable Slightly Ethereal  
Halocarbon-218 C3F8 None Established Nonflammable Slightly Sweet  
Halocarbon-C318 C4F8 None Established Nonflammable None  
Helium He Simple Asphyxiant Nonflammable None  
Hexane, n- C6H14 50 180 1.1 7.5 Mild  
Hydrogen H2 Simple Asphyxiant 4 75 None  
Hydrogen Bromide HBr C 2.0 C 7 Nonflammable Irritating 30
Hydrogen Chloride HCl C 2.0 C 3 Nonflammable Pungent, Suffocating 50
Hydrogen Sulfide H2S 10 14 4.3 46 Rotten Eggs 100
Isobutane CH(CH3)3 1000 2378 1.8 8.4 Slight  
Isobutylene (CH3)2C:CH2 250 574 1.8 9.6 Coal Gas  
Krypton Kr Simple Asphyxiant Nonflammable None  
Methane CH4 1000 656 5 15 None  
Methyl Chloride CH3Cl 50 103 8.1 17.4 Faintly, Sweet Ethereal 2000
Neon Ne Simple Asphyxiant Nonflammable None  
Nitric Oxide NO 25 31 Nonflammable Slightly Irritating 100
Nitrogen N2 Simple Asphyxiant Nonflammable None  
Nitrogen Dioxide NO2 3 5.6 Nonflammable Irritating 20
Nitrogen Trifluoride NF3 10 29 Nonflammable Mold-like 1000
Nitrous Oxide N2O 50 90 Nonflammable Slightly Sweet  
Oxygen O2 N/A N/A Nonflammable None  
Pentane, n- C5H12 600 1770 1.5 7.8 Parrafinic 1500
Phosphine PH3 0.3 0.42 1.6 98 Garlic-Like 50
Propane C3H8 1000 1804 2.1 9.5 Natural Gas-like 2100
Propylene CH2:CHCH3 500 861 2 11.1 Slightly Sweet  
Silane SiH4 5 6.6 1.4 96 Choking  
Silicon Tetrachloride SiCl4 None Established Nonflammable Pungent, Suffocating 100
Sulfur Dioxide SO2 2 5.2 Nonflammable Sharp, Pungent 100
Sulfur Hexafluoride SF6 1000 5973 Nonflammable None  
Trichlorosilane SiHCl3 None Established 7 83 Pungent, suffocating 100
Tungsten Hexafluoride WF6 None Established Nonflammable None 30
Xenon Xe Simple Asphyxiant Nonflammable None  

 

 

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