Oxygen 5
Oxygen 5 : A colorless, odorless, tasteless, gaseous chemical element that is the most abundant of all elements. It occurs free in our atmosphere of which it forms one-fifth, in volume, along with nitrogen. Oxygen is very active and is able to combine with most other elements. It is essential to the life and growth processes, as well as to combustion. In an atmosphere of pure oxygen, combustion is more intense than in an environment of atmospheric oxygen which is approximately only one-fifth pure oxygen and four-fifths nitrogen. Oxygen may be manufactured by liquefying air and separating the oxygen from the nitrogen by a process based on their differences in boiling points called fractionating; oxygen may also be produced by the electrolytic decomposition of water - separating it into its constituents; hydrogen and oxygen. Hydrogen gas is lighter than air, extremely explosive, and with a fairly wide explosive range. Liquid oxygen is used widely in industry. Liquid oxygen, reduced to the liquid state under extremely low temperatures and container stored, weighs about 71 lbs. per square foot and, at atmospheric pressure, its temperature is 297 degrees F. Carbonaceous material, mixed with liquid oxygen, is used as an explosive
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