Oxygen as a gas is slightly heavier than air, but will dispense fairly rapidly in a well-ventilated area. However, it can remain for long periods in cavities, trenches, pits and vessels. Oxygen will also remain for considerable periods in clothing or similar porous materials.
In combination with a fuel gas such as acetylene, hydrogen or LPG, it is used in welding, cutting, brazing, hardening, scarfing, flame cleaning and heating. Oxygen is used in the manufacture of steel, glass, ethylene oxide, methanol, acrolein, titanium dioxide, vinyl acetate and synthesis gas. It can be utilised in any chemical reaction where air is used to give faster reaction time and higher yields. Also suitable for laboratories, metal analysis and medical treatment