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oxygen
[ok-si-juhn]
noun
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. O; 15.9994; 8; density: 1.4290 grams/liter at 0°C and 760 millimeter pressure.
oxygen
/ ɒkˈsɪdʒɪnəs, ˌɒksɪˈdʒɛnɪk, ˈɒksɪdʒən /
noun
a colourless odourless highly reactive gaseous element: the most abundant element in the earth's crust (49.2 per cent). It is essential for aerobic respiration and almost all combustion and is widely used in industry. Symbol: O; atomic no: 8; atomic wt: 15.9994; valency: 2; density: 1.429 kg/m³; melting pt: –218.79°C; boiling pt: –182.97°C
( as modifier )
an oxygen mask
oxygen
A nonmetallic element that exists in its free form as a colorless, odorless gas and makes up about 21 percent of the Earth's atmosphere. It is the most abundant element in the Earth's crust and occurs in many compounds, including water, carbon dioxide, and iron ore. Oxygen combines with most elements, is required for combustion, and is essential for life in most organisms. Atomic number 8; atomic weight 15.9994; melting point −218.8°C; boiling point −182.9°C; gas density at 0°C 1.429 grams per liter; valence 2.
See Periodic Table
Other Word Forms
- oxygenic adjective
- oxygenous adjective
- oxygenicity noun
Word History and Origins
Word History
Example Sentences
"The truth is that healthy oceans are essential to all life on earth. They generate half of the world's oxygen, regulate our climate and provide food for more than three billion people," he said.
“I’m sure they will at some point,” she says of the songs, both of which tend to take up all the available oxygen in a room.
In these recordings, you can hear the back-and-forth chatter, along with the astronaut’s breathing and the background noise of their spacesuit pumping oxygen into their helmet to keep them alive.
Wynter died from a loss of oxygen flow to her brain which could have been prevented had staff delivered her earlier.
“The same comet also has molecular oxygen in it, right?” he countered.
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