Disclaimer: The information on this page has not been checked by an independent person.   Use this information at your own risk.
ROYMECH

Click arrows to page adverts

Home
Matter Index

Properties Of Gases

Physical Properties at ST & P..... Thermodynamic Properties at NT & P .....

Important Notes:

Please check data in these tables against other sources. I have provided links to reputable information sources for this purpose..




Notes:

The critical temperature is the maximum temperature at which a gas can be liquified. (above this temperature a liquid cannot exist)
The critical pressure is the pressure to liquify the gas at this temperature.
The critical density is the resulting density at these conditions
The viscosity values are in μP to obtain μPa.s = μN.s/m2 divide table values by 10
The properties ** are temperature related..



Physical Properties at ST & P

Properties are generally at Standard Temperature and Pressure (273 K, 1 atm)

Gas Formula MW Density
**
Freezing
Temp
Boiling
Temp
Critical
Temp
Critical
Pressure
Critical
Density
Thermal
Conductivity
**
Dynamic Viscosity
**
kg/m3 Deg K Deg. K Deg. K x 105 Pa kg/m3 (mW/m.K) μP
Acetylene C2H2 26.04 1.173 192.44(melt)
189 (subl.)
189.04 308.36 61.39 230.41 21.3 10.22
Air   29 1.293 59.15 78.67 132.45 37.7 316.56 24.1 181
Ammonia Nh4 17 0.77 83.84 87.32 150.1 112.8 235.29 24.2 10.13
Argon Ar 39.95 1.783 84 87 151 48.98 531 16.2 223
n-Butane C4H10 58.1 2.672 134.9 272.69 425.22 37.97 227.95 13.77 69.02
Carbon Dioxide CO2 44 1.977 194,7
sublimes
** 304 74 460 14.5 147
Carbon Monoxide CO 28.01 1.25 68.19 81.74 132.96 34.99 270.27 24.6 177.5
Chlorine Cl2 70.9 3.214 172.16 239.16 417.19 77.1 571.43 8.034 123
Ethane C2H6 30.07 1.356 90.39 184.59 305.06 48.8 203 21.18 93.76
Ethylene C2H4 28.05 1.26 104.04 169.45 282.2 50.4 214.13 17.97 93.76
Helium He 4.03 0.178 1.89 4.26 5.24 2.3 69.93 146 187
Hydrochloric Acid HCl 36.5 1.639 159 188 324 83.1 450.45 13.43 134
Hydrogen H2 2.02 0.09 14 20.4 33.23 13 31.4 168.4 88
Hydrogen Sulphide H2S 34.1 1.538 187.7 212.8 373.57 89.63 346.02 12.65 11.71
Methane CH4 16 0.716 90.71 111.7 190.6 46.04 161.58 30.01 103.3
Methyl Chloride CH3Cl 50.5 2.308 175.49 248.97 416.29 66.8 352.86 179.2 100.4
Natural Gas   19.5 0.862              
Neon Ne   0.902 24.59 27.13 44 26.53 483.79 46.11 297
Nitric Oxide NO 30 1.389 112.19 121.42 180.19 64.8 518.13 23.69 178
Nitrogen N2 28 1.25       33.9 311 24.3 174
Nitrous Oxide N2O 44 1.978 182.37 184.71 309.61 72.45 451.67 15.52 134.9
Oxygen O2 32 1.429 54 90 154 50.4 430 24.4 200
Propane C3H8 44.1 2.019 85.56 231.15 369.86 42.49 220.36 15.91 75.98
Sulphur Dioxide SO2 64.1 2.927 200.04 263.17 430.79 78.84 524.93 8.42 117.9

** Carbon dioxide has a triple point where solid liquid and gas co-exist at 216,6 K and 5,18 bar abs.



Thermodynamic Properties and NT & P


Properties in this generally at Normal Temperature and Pressure (293 K, 1 atm)
The properties are mostly temperature related

      Gas      Formula MW Density R
(Gas constant)
Cp Cv Cp/Cv= γ
(kg/m3) kJ/(kg.K) kJ/(kg.K) kJ/(kg.K)  
Acetylene C2H2 26 1.0925 0.32 1.465 1.127 1.3
Air   29 1.2045 0.287 1.009 0.721 1.4
Ammonia Nh4 17 0.7179 0.49 2.19 1.659 1.32
Argon Ar 39.9 1.661 0.208 0.519 0.311 1.67
n-Butane C4H10 58.1 2.4897 0.143 1.654 1.49 1.11
Carbon Dioxide CO2 44 1.8417 0.189 0.858 0.66 1.3
Carbon Monoxide CO 28 1.1648 0.297 1.017 0.726 1.4
Chlorine Cl2 70.9 2.9944 0.117 0.481 0.362 1.33
Ethane C2H6 30 1.2635 0.277 1.616 1.325 1.22
Ethylene C2H4 28 1.1744 0.296 1.675 1.373 1.22
Helium He 4 0.1663 2.078 5.234 3.153 1.66
Hydrochloric Acid HCl 36.5 1.5273 0.228 0.8 0.567 1.41
Hydrogen H2 2 0.0837 4.126 14.319 10.155 1.41
Hydrogen Sulphide H2S 34.1 1.4334 0.243 1.017 0.782 1.3
Methane CH4 16 0.6673 0.519 2.483 1.881 1.32
Methyl Chloride CH2Cl 50.5 2.15 0.165 1.005 0.838 1.2
Natural Gas   19.5 0.8034 0.426 2.345 1.846 1.27
Neon Ne 20.18 0.84        
Nitric Oxide NO 30 1.2941 0.277 0.967 0.691 1.4
Nitrogen N2 28 1.1648 0.297 1.034 0.733 1.41
Nitrous Oxide N2O 44 1.8429 0.189 0.925 0.706 1.31
Oxygen O2 32 1.331 0.26 0.909 0.649 1.4
Propane C3H8 44.1 1.8814 0.188 1.645 1.43 1.15
Sulphur Dioxide SO2 64.1 2.727 0.129 0.645 0.512 1.26


Links Providing similar information
  1. EngineeringToolbax ...Excellent source of Material Properties
  2. Efunda-Gas Properties...Efunda Detailed Reliable information
  3. Watlow - Refdata..Download link to Properties of Gases -Imperial
  4. Start WebElements An excellent source of information on all materials
  5. Flexware- Properties of Various Gases...large list of gases (Mol wt, Crit P & T

This Page is being developed

Home
Matter Index

Send Comments to Roy Beardmore

Last Updated 17/11/2010