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ni·tro·gen fix·a·tion

/ˈnītrəjən fikˈsāSHən/

noun
- 1. the chemical processes by which atmospheric nitrogen is assimilated into organic compounds, especially by certain microorganisms as part of the nitrogen cycle.
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19 hours ago · General relativity, also known as the general theory of relativity, and as Einstein's theory of gravity, is the geometric theory of gravitation published by Albert Einstein in 1915 and is the current description of gravitation in modern physics. General relativity generalizes special relativity and refines Newton's law of universal gravitation ...
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  Standard and classical physics theory of gravity and space
Nitrogen fixation
Process which converts nitrogen from the air into compounds such as ammonia
digital.sciencehistory.org
Nitrogen fixation is a chemical process by which molecular dinitrogen is converted into ammonia. It occurs both biologically and abiologically in chemical industries. Biological nitrogen fixation or diazotrophy is catalyzed by enzymes called nitrogenases. These enzyme complexes are encoded by the Nif genes (or Nif homologs) and contain iron, often with a second metal (usually molybdenum, but somet... Wikipedia
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