1) About 21 percent of air 2) About 21% of air 3) About 21% of the atmosphere 4) About a fifth of the air 5) Ambulance tankful 6) American Christian novel 7) American television network 8) Atmosphere element 9) Atmosphere gas 10) Atomic number 8 11) Breathing gas 12) Breathing need 13) Chemical element
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https://www.crosswordclues.com/clue/oxygen
1) Air 2) Element 3) Gas 4) Lox
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https://www.crosswordclues.com/clue/oxygen
(O) Element 8, atomic weight 15.9994, a colorless, odorless gas that makes up about 1/5 of the earth's atmosphere and (in combined form) 8/9ths of earth's oceans and almost half of the earth's crust. The name is derived from the French oxygène, which means 'acid generating'.
Found on
http://antoine.frostburg.edu/chem/senese/101/glossary/o.shtml
• (n.) 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. • (n.) Chlorine used in bleaching.
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http://thinkexist.com/dictionary/meaning/oxygen/
A colorless, odorless gas. It is needed for animal and plant life. Oxygen that is breathed in enters the blood from the lungs and travels to the tissues.
Found on
http://www.cancer.gov/dictionary?expand=O
(O) Oxygen atom Credit: NASA/World Book A colorless, odorless, gaseous element, the most abundant in Earth's crust (49.2% by mass) and the second most abundant in the atmosphere (28% by volume). Free oxygen is essential to the survival of all aerobic organisms. Oxy...
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http://www.daviddarling.info/encyclopedia/O/oxygen.html
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.
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http://www.emedicinehealth.com/allergy_insect_sting/glossary_em.htm
O a common gaseous element, occurring naturally in the air, water, and most minerals and organic substances, essential to the reciprocal processes of plant and animal life. Highly reactive combining with other atoms, molecules and compounds through a process known as burning. Exists in the air as free molecules O2 (O3 = ozone), and also dissolv...
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http://www.encyclo.co.uk/local/20722
1. <chemistry> A colourless, 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. ... It occurs combined in immense quantities, forming eight ninths by weight of wat...
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http://www.encyclo.co.uk/local/20973
(O) (ok´sĭ-jәn) a chemical element, atomic number 8, atomic weight 15.999. It is a colorless and odorless gas that makes up about 20 per cent of the atmosphere. In combination with hydrogen, it forms water; by weight, 90 per cent of water is oxygen. It is the third most abundant of all ...
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http://www.encyclo.co.uk/local/21001
A colorless, odorless and tasteless gas that makes up about 20% of the air we breathe (and at least
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http://www.encyclo.co.uk/local/22417
(Humans as organisms) gaseous element making up about 20% of the air, which is needed by living organisms for respiration
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http://www.encyclo.co.uk/visitor-contributions.php
Ox'y·gen noun [ French
oxygène , from Greek ............ sharp, acid + root of ............ to be born. So called because originally supposed to be an essential part of every
acid .]
1. (Chemistry) A colorless, tasteless, odorless, gaseous element occurring in the free stat...
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http://www.encyclo.co.uk/webster/O/62
(O) Type: Term Pronunciation: ok′si-jen Definitions: 1. A gaseous element, atomic no. 8, atomic wt. 15.9994 on the basis of 12C = 12.0000; an abundant and widely distributed chemical element, which combines with most other elements to form oxides and is essential to animal and plant life. 2. The molecular form of oxygen, O
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http://www.medilexicon.com/medicaldictionary.php?t=64236
A colourless, odourless, tasteless, non-metallic, gaseous element.
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http://www.vidyagyaan.com/general-knowledge/basic-chemistry-element-terms-a
a gas that is needed by many living organisms
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https://sciencetrek.org/sciencetrek/topics/body_waste/glossary.cfm
a gas found in the atmosphere that animals and humans breathe, produced by plants during photosynthesis
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https://sciencetrek.org/sciencetrek/topics/botany/glossary.cfm
a colorless, odorless, tasteless gas, that is necessary to live
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https://sciencetrek.org/sciencetrek/topics/heart/glossary.cfm
a gaseous element needed for breathing
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https://sciencetrek.org/sciencetrek/topics/water/glossary.cfm
A colourless and odourless element that is essential for most life forms on earth. The name is derived from the French oxygène, which means 'acid generating'. Symbol O Also known as Vital air.Discovered1774 Priestley publishes his work on oxygen.AbundanceThe most abundant element on earth, making up about 1/5 of the earth's atmosphere and 8/9ths o...
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https://www.encyclo.co.uk/local/20687
a gas that is colourless, odourless, and tasteless; essential to almost all forms of life
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https://www.encyclo.co.uk/local/20875
O noun 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
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https://www.encyclo.co.uk/local/20974
A gas which comprises about 21% of normal air. Yeast require oxygen for healthy reproduction; this is why the wort should be aerated at pitching time. At any other stage of the brewing or fermentation process, oxygen is not desirable, because it can oxidize compoinds in the wort or beer, resulting in stale flavors.
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https://www.encyclo.co.uk/local/22622
A gas which is present in the air and which is absorbed by the blood from the air we breathe. It is necessary for the proper functioning of the body cells.
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https://www.encyclo.co.uk/local/22791
a colorless, odorless, gaseous element constituting about one-fifth of the volume of the atmosphere and present in a combined state in nature. It is the supporter of combustion in air and was the standard of atomic, combining, and molecular weights until 1961, when carbon 12 became the new standard. Symbol: O; at. wt.: 15.9994; at. no.: 8; densi......
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https://www.infoplease.com/dictionary/oxygen
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