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Specialty Gases Reference Guide

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Technical Data Physical Properties of Gases Physical Properties of Gases Gas Atomic or Molecular Weight Normal Boiling Point (nbp) Freezing Point Triple Point (tp) Critical Point Density Gas, NTP Gas, STP Vapor, nbp Liquid, nbp Specific Heat, Cp, Gas, NTP Btu/lb °F Specific Heat Ratio, Cp/Cv, Gas, NTP Heat of Vaporization, nbp Heat of Fusion, tp * Denotes sublimation temperature at 1 atmosphere. Gas Physical Property Equivalents of Gases Mass Tons Pounds Argon 1 0.0005 0.0011023 5.170 x 10-5 0.001536 0.005814 Carbon Dioxide 1 0.0005 0.0011023 5.72 x 10-5 0.001119 0.004235 Helium 1 0.0005 0.0011023 5.170 x 10-6 1.377 x 10-4 5.212 x 10-4 Neon 1 0.0005 0.0011023 2.608 x 10-5 0.001330 0.005036 Nitrogen 1 0.0005 0.0011023 3.622 x 10-5 8.910 x 10-4 0.003373 Oxygen 1 0.0005 0.0011023 4.140 x 10-5 0.001258 0.004764 2000 1 2.205 0.1034 3.072 11.63 2000 1 2.205 0.11442 2.238 8.471 2000 1 2.205 0.01034 0.2754 1.042 2000 1 2.205 0.05215 2.661 10.07 2000 1 2.205 0.07245 1.782 6.746 2000 1 2.205 0.08281 2.517 9.527 °F °F °F psia °F psia lb/ft3 lb/ft3 lb/ft3 lb/ft3 Argon 39.948 -302.6 -308.9 -308.9 10.0 -188.1 710.0 0.1034 0.1114 0.363 86.98 Btu/lb Btu/lb 0.125 1.67 70.2 12.7 Carbon Dioxide 44.010 -109.3* -109.3 -69.8 75.2 87.9 1071.0 0.1144 0.1234 – 63.36** 0.20 1.31 246.6* 85.6 Helium 4.0026 -452.1 – – – -450.3 33.2 0.01034 0.01114 1.04 7.798 1.25 1.66 8.72 – Neon 20.183 -410.9 -415.5 -415.5 6.3 -380.0 395.0 0.05215 0.05618 0.596 75.35 0.246 1.66 37.0 7.1 ** Liquid density at 2 °F and 302 psig. Nitrogen 28.013 -320.4 -346.0 -346.0 1.8 -232.5 493.0 0.07245 0.07805 0.287 50.46 0.247 1.41 85.7 11.1 Oxygen 31.999 -297.3 -361.8 -361.8 0.022 -181.1 737.0 0.08281 0.08921 0.279 71.27 0.220 1.40 91.7 6.0 Volume Kilograms 907.2 0.4536 1 0.04690 1.393 5.274 907.2 0.4536 1 0.05189 1.0148 3.842 907.2 0.4536 1 0.004690 0.1249 0.4728 907.2 0.4536 1 0.02365 1.207 4.569 907.2 0.4536 1 0.03286 0.8083 3.060 907.2 0.4536 1 0.03756 1.142 4.322 Cubic Feet Gas at NTP 1.934 x 104 9.671 21.32 1 29.71 112.5 1.748 x 104 8.74 19.27 1 19.558 74.03 1.934 x 105 96.71 213.2 1 26.63 100.8 3.835 x 104 19.18 42.27 1 51.03 193.2 2.761 x 104 13.80 30.43 1 24.60 93.11 2.415 x 104 12.08 26.62 1 30.39 115.1 Liters Liquid at nbp 651.1 0.3256 0.7177 0.03366 1 3.785 893.8* 0.4469* 0.9854* 0.05113* 1* 3.785* 7263.0 3.631 8.006 0.03755 1 3.785 751.6 0.3758 0.8285 0.01960 1 3.785 1122.0 0.5612 1.237 0.04066 1 3.785 794.6 0.3973 0.8759 0.03290 1 3.785 Gallons Liquid at nbp 172.0 0.08600 0.1896 0.008893 0.2642 1 236.1* 0.11806* 0.2603* 0.013508* 0.2642* 1* 1919.0 0.9593 2.115 0.009919 0.2642 1 198.6 0.09928 0.2189 0.005177 0.2642 1 296.5 0.1482 0.3268 0.01074 0.2642 1 209.9 0.1050 0.2314 0.008692 0.2642 1 Heat of Vaporization Btu 1.40 x 105 70.2 155.0 7.26 216.0 816.0 4.93 x 105 247.0 544.0 28.2 552.0 2089.0 1.74 x 104 8.72 19.2 0.0902 2.40 9.09 7.40 x 104 37.0 81.6 1.93 98.5 373.0 1.71 x 105 85.7 189.0 6.21 153.0 578.0 1.83 x 105 91.7 202.0 7.59 231.0 874.0 Kilogram- Calories 3.54 x 104 17.7 39.0 1.83 54.3 206.0 1.24 x 105 62.1 137.0 7.11 139.0 526.0 4.39 x 103 2.20 4.84 0.0227 0.605 2.29 1.86 x 104 9.32 20.6 0.486 24.8 93.9 4.32 x 104 21.6 47.6 1.56 38.5 146.0 4.62 x 104 23.1 50.9 1.91 58.2 220.0 H 11 1-877-PRAXAIR www.praxair.com/specialtygases

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