Difference between revisions of "Oxygen"
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== Description == | == Description == | ||
| − | A nonmetallic gaseous element. Oxygen is the most abundant element on earth; it makes up 46.6% of the earth's crust and 20.95% of the earth's atmosphere where it exists primarily as a diatomic gas, O2. Oxygen was first recognized as an element by Joseph Priestly in 1774. It liquefies at -133C (at a pressure of 59 atmospheres). Liquid oxygen is used in medicine and diving as a breathing aid. It is also use for [ | + | A nonmetallic gaseous element. Oxygen is the most abundant element on earth; it makes up 46.6% of the earth's crust and 20.95% of the earth's atmosphere where it exists primarily as a diatomic gas, O2. Oxygen was first recognized as an element by Joseph Priestly in 1774. It liquefies at -133C (at a pressure of 59 atmospheres). Liquid oxygen is used in medicine and diving as a breathing aid. It is also use for [[acetylene|acetylene]] and oxyhydrogen torches to weld and cut metals. Oxygen and oxidizing agents can corrode metals. Some metals, such as [[aluminum|aluminum]], form an initial protective oxide layer that inhibits further reactions, while other metals, such as [[iron|iron]], are continually reactive. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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O; O2; dephlogisticated air; empyreal air; vital air; pure air; Zuurstof (Ned.); oxygène (Fr.); Sauerstoff (Deut.); ossigeno (It.); Oxigênio (Port.); oxi´geno (Esp.); Syre (Sven.) | O; O2; dephlogisticated air; empyreal air; vital air; pure air; Zuurstof (Ned.); oxygène (Fr.); Sauerstoff (Deut.); ossigeno (It.); Oxigênio (Port.); oxi´geno (Esp.); Syre (Sven.) | ||
| + | == Risks == | ||
| + | |||
| + | * Supports combustion. Electric sparks can cause an explosion in oxygen enriched air. | ||
| + | * Airgas: [https://www.airgas.com/msds/001043.pdf SDS] | ||
| + | |||
| + | ==Physical and Chemical Properties== | ||
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! scope="row"| Melting Point | ! scope="row"| Melting Point | ||
| − | | -218.4 | + | | -218.4 C |
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! scope="row"| Molecular Weight | ! scope="row"| Molecular Weight | ||
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! scope="row"| Boiling Point | ! scope="row"| Boiling Point | ||
| − | | -182.96 | + | | -182.96 C |
|} | |} | ||
| − | == | + | == Resources and Citations == |
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| − | + | * Web Elements: [http://www.webelements.com/webelements/elements/text/O/key.html Website] | |
* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 566 | * G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 566 | ||
Latest revision as of 09:48, 4 August 2022
Description
A nonmetallic gaseous element. Oxygen is the most abundant element on earth; it makes up 46.6% of the earth's crust and 20.95% of the earth's atmosphere where it exists primarily as a diatomic gas, O2. Oxygen was first recognized as an element by Joseph Priestly in 1774. It liquefies at -133C (at a pressure of 59 atmospheres). Liquid oxygen is used in medicine and diving as a breathing aid. It is also use for Acetylene and oxyhydrogen torches to weld and cut metals. Oxygen and oxidizing agents can corrode metals. Some metals, such as Aluminum, form an initial protective oxide layer that inhibits further reactions, while other metals, such as Iron, are continually reactive.
Synonyms and Related Terms
O; O2; dephlogisticated air; empyreal air; vital air; pure air; Zuurstof (Ned.); oxygène (Fr.); Sauerstoff (Deut.); ossigeno (It.); Oxigênio (Port.); oxi´geno (Esp.); Syre (Sven.)
Risks
- Supports combustion. Electric sparks can cause an explosion in oxygen enriched air.
- Airgas: SDS
Physical and Chemical Properties
| Composition | O (atomic no. 8) |
|---|---|
| CAS | 7782-44-7 |
| Melting Point | -218.4 C |
| Molecular Weight | atomic wt = 15.9994 |
| Boiling Point | -182.96 C |
Resources and Citations
- Web Elements: Website
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 566
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 7098
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
- Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985