Noun
A colorless, tasteless, odorless, gaseous element occurring in the free state in the atmosphere, of which it forms about 23 per cent by weight and about 21 per cent by volume, being slightly heavier than nitrogen. Symbol O. Atomic weight 15.96.
Chlorine used in bleaching.
Source: Webster's dictionaryFreedom is the oxygen of the soul. Moshe Dayan
Democratic nations must try to find ways to starve the terrorist and the hijacker of the oxygen of publicity on which they depend. Margaret Thatcher
Mars is essentially in the same orbit. Mars is somewhat the same distance from the Sun, which is very important. We have seen pictures where there are canals, we believe, and water. If there is water, that means there is oxygen. If there is oxygen, then w. Dan Quayle
Information is the oxygen of the modern age. Ronald Reagan
The animals of the planet are in desperate peril... Without free animal life I believe we will lose the spiritual equivalent of oxygen. Alice Walker
Usage is like oxygen for ideas. Matt Mullenweg