The human body has no biological process using argon. However, in greater than atmospheric concentrations, it has been shown to both increase the consumption of oxygen by cells, and conversely to mitigate the effect of acute hypoxia (in lab rats).
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Argon makes up about 0.93% of Earth's atmosphere by volume.
Hydrogen makes up about 0.000055% of Earth's atmosphere by volume. It is one of the least abundant gases in the atmosphere.
Argon makes up about 0.934% of Earth's atmosphere by volume. It is produced through the radioactive decay of potassium-40 in the Earth's crust and is the third most abundant gas in the atmosphere, after nitrogen and oxygen.
About 99% of Earth's atmosphere is composed of gases, primarily nitrogen (78%) and oxygen (21%). Other gases like argon, carbon dioxide, and water vapor make up the remaining 1%.
The Earth's atmosphere is composed of about 78 nitrogen, 21 oxygen, and small amounts of other gases like argon, carbon dioxide, and water vapor. Overall, the atmosphere extends about 300 miles above the Earth's surface and contains approximately 5.15 quadrillion tons of air.