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  1. Chromservis
  2. Gas Detection
  3. General Gas Properties
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Gas Detection

Gas PrinciplesGas TablesGeneral Gas Properties
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        Gas Properties

        The most common gases

        There are several information about the most common gases, such as gas name, molecular formula, CAS number, LEL and appearance.

        Gas name Formula CAS LEL % vol. Properties
        Ammonia NH3 7664-41-7 15 colourless, smitch
        Arsine AsH3 7784-42-1 x colourless, it is possible to smell a slight, garlic or fish like scent
        Bromine Br2 7726-95-6 x fuming red to brown liquid, with pungent odour
        Carbon dioxide CO2 124–38–9 x colourelss, odourless (in high concentration human nose feels "sparkling water")
        Carbon monooxide CO 630-08-0 12.5 colourelss, odourless
        Chlorine Cl2 7782-50-5 x yellow gas, "desinfection" odour
        Chlorine dioxide ClO2 10049-04-4 x reddish-yellow gas
        Diborane B2H6 19287-45-7 x colourless
        Ethylen oxid (oxirane) C2H4O 75-21-8 3.0 colourless flammable gas with a faintly sweet odour
        Fluorine F2 7782-41-4 x pale, yellowish brown gas, supremely reactive
        Hydrogen H2 1333-74-0 4,0 colourless
        Hydrogen cyanide HCN 74-90-8 x colourless,
        Hydrogen fluoride HF 7664-39-3 x colourless solution, extremely corrosive
        Hydrogen sulphide H2S 7783-06-4 4.3 colourless, sick eggs-like-smell
        Methane CH4 74-82-8 5 colourless, odourless
        Nitric oxide NO 10102-43-9 x colourless, paramagnetic
        Nitrogen dioxide NO2 10544-72-6 x brown gas
        Phosphine (phosphane) PH3 7803-51-2 x colourless, odourless, but technical grade have a highly unpleasant odor like garlic or rotting fish
        Sulfur dioxide SO2 7446-09-5 x colourless, pungent scent