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Oxygen - Dictionary Definition and Overview |
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Oxygen : (noun)
1: a nonmetallic bivalent element that is normally a colorless
odorless tasteless nonflammable diatomic gas; constitutes
21 percent of the atmosphere by volume; the most abundant
element in the earth's crust [syn: O, atomic number 8]
Based on WordNet 2.0
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Oxygen : \Ox"y*gen\, n. [F. oxyg[`e]ne, from Gr. ???? sharp, acid
_ root of ???? to be born. So called because originally
supposed to be an essential part of every acid.]
1. (Chem.) 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.
Note: It occurs combined in immense quantities, forming eight
ninths by weight of water, and probably one half by
weight of the entire solid crust of the globe, being an
ingredient of silica, the silicates, sulphates,
carbonates, nitrates, etc. Oxygen combines with all
elements (except fluorine), forming oxides, bases,
oxyacid anhydrides, etc., the process in general being
called oxidation, of which combustion is only an
intense modification. At ordinary temperatures with
most substances it is moderately active, but at higher
temperatures it is one of the most violent and powerful
chemical agents known. It is indispensable in
respiration, and in general is the most universally
active and efficient element. It may be prepared in the
pure state by heating potassium chlorate. This element
(called dephlogisticated air by Priestley) was named
oxygen by Lavoisier because he supposed it to be a
constituent of all acids. This is not so in the case of
a very few acids (as hydrochloric, hydrobromic, hydric
sulphide, etc.), but these do contain elements
analogous to oxygen in property and action. Moreover,
the fact that most elements approach the nearer to acid
qualities in proportion as they are combined with more
oxygen, shows the great accuracy and breadth of
Lavoisier's conception of its nature.
2. Chlorine used in bleaching. [Manufacturing name]
Based on Webster's Revised Unabridged Dictionary
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Oxygen : Symbol: O
Atomic number: 8
Atomic weight: 15.9994
A colourless, odourless gaseous element belonging to group 16 of the
periodic table. It is the most abundant element present in the earth's
crust. It also makes up 20.8% of the Earth's atmosphere. For industrial
purposes, it is separated from liquid air by fractional distillation. It
is used in high temperature welding, and in breathing. It commonly comes
in the form of Oxygen, but is found as Ozone in the upper atmosphere. It
was discovered by Priestley in 1774.
Based on Elements database 20001107 [ELEM_Dictionary]:
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Oxygen : Oxygen: A colorless, odorless and tasteless gas that makes up about 20% of the air we breathe (and at least half the weight of the entire solid crust of the earth) and which combines with
most of the other elements to form oxides. Oxygen is essential to human, animal and plant life.
The chemical symbol for the element oxygen is O. As a medicinal gas, oxygen contains not less than 99.0% by volume of O2.
Oxygen was discovered by Scheele and Priestly independently of each other in 1772 and 1774, respectively. They did not name it "oxygen." Priestly called it dephlogisticated air. (Priestly discovered
three other chemical compounds, one of which, anesthetic agent, as during dental procedures.)
The word "oxygen" came from the French "oxygene." It was so named by the French scientist Antoine Lavoisier (1743-94) who thought it was a necessary ingredient in all acids. This is not so.
Hydrochloric acid (HCl), for example, contains no oxygen.
Shortly after its discovery, oxygen was used for medical purposes. In 1780 Chaussier in France experimented with giving oxygen to newborn infants who had failed to establish normal intubation
and intermittent positive pressure insufflation ("bagging") with a mixture of oxygen and carbon dioxide for resuscitation of newborns.
Based on Elements database 20001107 [ELEM_Dictionary]:
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Example Usage of Oxygen |
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Reiuzi_Utsuho: @Oxygen_thp うにゅ？わかったわ！ 家の前で話してるオヤジどもに爆符「ぺタフレア」！ |
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Kochiya_Sanae: @Oxygen_thp いきますよ！ 家の前で話してるオヤジどもに奇跡「神の風」！ |
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oamartin9o: RT @thelagerlounge: "Not all chemicals are bad. Without chemicals such as hydrogen and Oxygen, for example, there would be no way to... ... |
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