free oxygen
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Oxygen toxicity — Classification and external resources In 1942–43 the UK Government carried out extensive testing for oxygen toxicity in divers. The chamber is pressurised with air to 3.7 … Wikipedia
Oxygen evolution — is the process of generating molecular oxygen through chemical reaction. Mechanisms of oxygen evolution include the oxidation of water during oxygenic photosynthesis, electrolysis of water into oxygen and hydrogen, and electrocatalytic oxygen… … Wikipedia
free — [frē] adj. freer, freest [ME fre < OE freo, not in bondage, noble, glad, illustrious, akin to Ger frei, Du vrij < IE base * prei , to be fond of, hold dear > FRIEND, Sans priyá , dear, desired] 1. a) not under the control of some other… … English World dictionary
Oxygen — This article is about the chemical element and its most stable form, O2 or dioxygen. For other forms of this element, see Allotropes of oxygen. For other uses, see Oxygen (disambiguation). nitrogen ← oxygen → fluorine ↑ O ↓ … Wikipedia
Oxygen cycle — The oxygen cycle. The Oxygen cycle is the biogeochemical cycle that describes the movement of oxygen within its three main reservoirs: the atmosphere (air), the total content of biological matter within the biosphere (the global sum of all… … Wikipedia
oxygen — oxygenic /ok si jen ik/, oxygenous /ok sij euh neuhs/, adj. oxygenicity /ok si jeuh nis i tee/, n. /ok si jeuhn/, n. Chem. a colorless, odorless, gaseous element constituting about one fifth of the volume of the atmosphere and present in a… … Universalium
free — freeness, n. /free/, adj., freer, freest, adv., v., freed, freeing. adj. 1. enjoying personal rights or liberty, as a person who is not in slavery: a land of free people. 2. pertaining to or reserved for those who enjoy personal liberty: They… … Universalium
free — free1 W1S1 [fri:] adj ▬▬▬▬▬▬▬ 1¦(no cost)¦ 2¦(not a prisoner)¦ 3¦(not controlled)¦ 4¦(not busy)¦ 5¦(not being used)¦ 6¦(not suffering)¦ 7¦(not containing something)¦ 8¦(tax)¦ 9 feel free 10 free and easy … Dictionary of contemporary English
free — 1 /fri:/ adjective ALLOWED TO DO WHAT YOU WANT 1 allowed to do whatever you want, without being controlled or restricted : free to do sth: The children are free to decide which activity they would like to do. 2 feel free spoken used to tell… … Longman dictionary of contemporary English
free — I UK [friː] / US [frɪ] adjective Word forms free : adjective free comparative freer superlative freest *** 1) something that is free does not cost anything All talks start at 2.30 pm and admission is free. There is plenty of free parking. free… … English dictionary
free — I. adjective (freer; freest) Etymology: Middle English, from Old English frēo; akin to Old High German frī free, Welsh rhydd, Sanskrit priya own, dear Date: before 12th century 1. a. having the legal and political rights of a citizen b. enjoying… … New Collegiate Dictionary
