All life requires nitrogen compounds, e.g., proteins and nucleic acids. Air, which is 79% nitrogen gas (N2), is the major reservoir of nitrogen. But most organisms cannot use nitrogen in this form. Plants must secure their nitrogen in “fixed” form, i.e., incorporated in compounds such as: nitrate ions (NO3−), ammonium ions (NH4+) and urea (NH2)2CO. … Read more
You inhale nitrogen along with oxygen because air is a mixture of gases, with nitrogen making up about 78%. Your body does not use this nitrogen for metabolic processes; it is mostly inert and is exhaled unchanged, along with carbon dioxide. Inhalation: When you breathe, you inhale a mixture of gases, including roughly 78% nitrogen, … Read more
Earth’s atmospheric nitrogen originated from the primordial solar system, likely trapped in the rocks that formed the planet and released through volcanic activity. Its current high abundance (78%) is due to its stability; the strong triple bond between the two nitrogen atoms makes it inert and resistant to chemical reactions that would have consumed it … Read more
