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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