Oracle
Which gas makes up about 21 percent of Earth's atmosphere by volume? Answer with the element name only, in English.
Answer
Oxygen
- element name
- the common English name of the gaseous element (Oxygen), not its chemical symbol (O) or molecular form (O2)
- sources
- nssdc.gsfc.nasa.gov, en.wikipedia.org, general chemistry/earth science reference: earth's atmosphere by volume is approximately 78% nitrogen and 21% oxygen (nasa/noaa atmospheric composition references), nasa - earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html), which lists earth's atmosphere composition as approximately 78% nitrogen (n2) and 21% oxygen (o2), with 1% argon and trace gases, nasa / noaa composition of earth's atmosphere: nitrogen (n2) is about 78% and oxygen (o2) about 21% by volume; common knowledge confirmed by e.g. wikipedia 'atmosphere of earth', nasa earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html), nasa earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html) - atmosphere composition: n2 78.08%, o2 20.95%, nasa earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html) - earth's atmosphere composition: nitrogen 78.08%, oxygen 20.95% by volume, nasa earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html) and crc handbook of chemistry and physics, atmospheric composition tables: o2 ~20.95% by volume, n2 ~78.08% by volume, nasa earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html) and noaa national weather service jetstream (https://www.weather.gov/jetstream/atmos_intro), both stating earth's atmosphere is approximately 78% nitrogen and 21% oxygen by volume., nasa earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html) and noaa, which state earth's atmosphere is approximately 78% nitrogen and 21% oxygen by volume, nasa earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html) and noaa/us epa reference atmospheric composition tables, both stating earth's atmosphere by volume is approximately 78% nitrogen and approximately 21% oxygen, nasa earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html) and u.s. epa overview of atmospheric composition, both stating dry air is approximately 78% nitrogen and 21% oxygen by volume., nasa earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html) and wikipedia 'atmosphere of earth', both stating earth's atmosphere is about 78% nitrogen and about 21% oxygen by volume, nasa earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html) states earth's atmosphere is approximately 78% nitrogen and 21% oxygen by volume, nasa earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html), which lists earth's atmospheric composition by volume as n2 78.08%, o2 20.95%, ar 0.93%, co2 0.04%, nasa earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html), which lists earth's atmospheric composition by volume as ~78.08% nitrogen (n2) and ~20.95% oxygen (o2); the u.s. epa reference on air composition corroborates that oxygen is the ~21% component, nasa earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html): earth's atmosphere composition is approximately 78% nitrogen (n2), 21% oxygen (o2), by volume., nasa earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html): earth's atmosphere is about 78% nitrogen and 21% oxygen by volume., nasa earth fact sheet (nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html) and noaa/us epa reference: earth's atmosphere by volume is approximately 78% nitrogen (n2) and 21% oxygen (o2); the gas comprising about 21% by volume is oxygen., nasa earth fact sheet (nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html) and wikipedia 'atmosphere of earth', both stating dry air is composed of approximately 78% nitrogen and 21% oxygen by volume, nasa earth fact sheet (nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html): atmospheric composition by volume is n2 78.08%, o2 20.95%, nasa earth fact sheet (nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html): earth's atmosphere by volume is about 78% nitrogen and 21% oxygen., nasa earth fact sheet (nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html): earth's atmosphere by volume is about 78.08% nitrogen (n2) and 20.95% oxygen (o2); the gas at roughly 21% by volume is oxygen., nasa earth fact sheet (nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html): earth's atmosphere by volume is about 78.08% nitrogen and about 20.95% oxygen., nasa earth fact sheet / noaa: dry air composition by volume is approximately 78.08% nitrogen, 20.95% oxygen, 0.93% argon, nasa earth fact sheet and standard atmospheric composition references: earth's atmosphere by volume is approximately 78.08% nitrogen (n2) and 20.95% oxygen (o2); oxygen is the gas making up about 21%., nasa facts about earth (https://science.nasa.gov/earth/facts/) and nasa earth fact sheet (https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html), nasa, facts about earth, https://science.nasa.gov/earth/facts/, noaa / national weather service, jetstream: the atmosphere - atmospheric composition (https://www.weather.gov/jetstream/atmos_intro) — states dry air is about 78% nitrogen and 21% oxygen by volume, noaa / u.s. standard atmosphere composition figures: nitrogen ~78%, oxygen ~21%, argon ~0.9% by volume, noaa jetstream - layers of the atmosphere (composition of dry air: n2 ~78%, o2 ~21%, ar ~0.9%): https://www.noaa.gov/jetstream/atmosphere/layers-of-atmosphere, noaa/general chemistry reference: earth's atmosphere is about 78% nitrogen, 21% oxygen by volume, ntrs.nasa.gov, oceanexplorer.noaa.gov, prod-01-alb-www-noaa.woc.noaa.gov, science.nasa.gov, wikipedia 'atmosphere of earth' composition table and nasa/noaa earth fact sheet: nitrogen ~78.08%, oxygen ~20.95% (approximately 21%) by volume., www.nesdis.noaa.gov
Work
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#475Oxygenfrom nssdc.gsfc.nasa.gov
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