Gas Charts

Relative Thermal Conductivity of Gases

Name Chemical Formula Conductivity (Relative to Air)
Air   1.00
Ammonia NH3 0.92
Argon Ar 0.68
Butane C4H10 0.60
Carbon Dioxide CO2 0.62
Carbon Monoxide CO 0.97
Ethane C2H6 0.79
Helium He 5.84
Hydrogen H2 7.07
Krypton Kr 0.37
Methane CH4 1.29
Neon Ne 1.87
Nitric Oxide NO 0.99
Nitrogen N2 1.00
Nitrogen Dioxide NO2 or N2O4 1.51
Nitrous Oxide N2O 0.65
Oxygen O2 1.02
Sulfur Dioxide SO2 0.38
Water Vapor H2O 0.67

Typical Gases Used

Flow Rate of 50 cm3/min
Test Preparation
Gas
Carrier
Gas
Loop
Gas
Other
TPR Experiment Argon 10% H2 in Argon N/A  
Calibration N/A Argon TCD Level Calibration
TPD Ammonia Helium or 15% NH3 in Helium Helium N/A  
Calibration N/A NH3 in Helium TCD Level Calibration
TPD Hydrogen 10% H2 in Argon Argon N/A Calibration
Calibration N/A 10% H2 in Argon TCD Level Calibration
TPD Oxygen 10% O2 in Helium Helium N/A  
Calibration N/A 10% O2 in Helium TCD Level Calibration
TPO Experiment Helium 10% O2 in Helium N/A  
Calibration N/A Helium TCD Level Calibration
H2 Pulse Chemical Adsorption 10% H2 in Argon Argon 10% H2 in Argon  
CO Pulse Chemical Adsorption Helium 10% CO in Helium  
Calibration Not Required
BET Surface Area Helium 30% N2 in Helium N/A  
Calibration N/A User-defined manual injections of N2 (0.5, 1.0, 1.5, and 2.0 cm3)

Gas Conversion Constants

The ChemiSorb analyzer uses a Mass Flow Controller (MFC) to control the flow of gases. The MFC requires a conversion constant for each gas or gas mixture to compensate for variations in gas flows resulting from variations in the properties of gases. A default gas table containing MFC conversion constants is included on the Options menu. The following table provides a more complete list of gases and their conversion constants.

Gas Conversion Constants for the MFC
Gas Symbol MFC Conversion Constant
(H2 = 1.000)
Acetylene C2H2 0.6535
Air (mixture)   0.9901
Allene C3H4 0.4752
Ammonia NH3 0.7822
Argon Ar 1.3861
Arsine A5H3 0.7525
Boron Trichloride BCl3 0.4356
Boron Trifluoride BF3 0.5743
Bromine Pentafluoride BrF5 0.2871
Bromine Trifluoride BrF3 0.4356
Butane C4H10 0.2871
Butene C4H8 0.3267
Carbon Dioxide CO2 0.7723
Carbon Monoxide CO 0.9802
Carbon Tetracloride CCl4 0.3465
Carbon Tetrafluoride CF4 0.4752
Carbonyl Fluoride COF2 0.2673
Carbonyl Sulfide COS 0.6733
Chlorine Cl2 0.8218
Chloroform CHCl3 0.4356
Chlorine Trifluoride ClF3 0.4257
Cyanogen C2N2 0.4950
Cyclopropane C3H6 0.5050
Deuterium D2 0.9901
Diborane B2H6 0.5446
Dichlorosilane SiH2Cl2 0.4356
Dimethylamine (CH3)2NH 0.6634
Dimethylether (CH3)2O 0.5842
Ethane C2H6 0.5446
Ethyl Chloride C2H5Cl 0.2871
Ethylene C2H4 0.6139
Ethylene Oxide C2H4O 0.5842
Fluorine F2 0.9208
Fluroform CHF3 0.5644
Freon 11 CCl3F 0.3762
Freon 12 CCl3F2 0.3861
Freon 13 CClF3 0.4257
Freon 13 B1 CBrF3 0.4059
Freon 14 CF4 0.4703
Freon 21 CHCl2F 0.4554
Freon 22 CHClF2 0.5050
Freon 23 CHF3 0.5644
Freon 113 CCl2F-CClF2 0.2277
Freon 114 CCl2F4-CClF2 0.2554
Freon 115 CClF2-CF3 0.2713
Freon 116 CF3-CF3 0.2277
Germane GeH4 0.6436
Helium He 1.3762
Hexamethyldisizane HMDS 0.1386
Hydrogen H2 1.0000
Hydrogen Bromide HBr 0.9703
Hydrogen Chloride (Dry) HCl 0.9802
Hydrogen Fluoride HF 0.9901
Hydrogen Iodide HI 0.9505
Hydrogen Selenide H2Se 0.8317
Hydrogen Sulfide H2S 0.8416
Isobutane C4H10 0.3069
Isobutylene C4H8 0.3366
Krypton Kr 1.3762
Methane CH4 0.8020
Methylamine CH3NH2 0.5644
Methyl Bromide CH3Br 0.6436
Methyl Chloride CH3Cl 0.6832
Methyl Fluoride CH3F 0.7525
Methyl Mercaptan CH4S 0.5842
Neon Ne 1.3861
Nitric Oxide NO 0.9901
Nitrogen N2 0.9950
Nitrogen Dioxide NO2 0.7525
Nitrogen Trioxide N2O3 0.4356
Nitrogen Trifluoride NF3 0.5446
Nitrous Oxide N2O 0.7426
Oxygen O2 0.9802
Ozone O3 0.7327
Pentaborane B5Hg 0.2871
n Pentane C5H12 0.2376
Perchloryl Fluoride ClO3F 0.4455
Phosgene COCl2 0.5050
Phosphine PH3 0.7822
Phosphorous Pentafluoride PF5 0.3465
Propane C3H8 0.3861
Propylene (Propene) C3H6 0.4653
Silane SiH4 0.6733
Silicon Tetrachloride SiCl4 0.3168
Silicon Tetrafluoride SiF4 0.3960
Sulfur Dioxide SO2 0.7228
Sulfur Hexafluoride SF6 0.2970
Trichlorosilane Cl3HSi 0.3267
Trimethylamine (CH3)3N 0.3168
Tungsten Hexafluoride WF6 0.2871
Uranium Hexafluoride UF6 0.2178
Vinyl Bromide C2H3Br 0.5248
Vinyl Chloride C2H3Cl 0.5347
Vinyl Fluoride C2H3F 0.5743
Xenon Xe 1.3762
 
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