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Where is most nitrogen found?

Answer 1

atmosphere

Nitrogen is notoriously difficult to remove from the atmosphere (~80% of air is inert nitrogen gas). Only nitrogen fixing bacteria, lightning and modern industry (via Haber-Bosche Cycle) remove nitrogen from the air so that it can be made available to living systems (protein and DNA are dependent on nitrogen).

nitrogen returns to the atmosphere via denitrifying bacteria, making it (the atmosphere) the largest reservoir. Living things would represent the next largest reservoir.

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Answer 2

Jose Arroyo

Most nitrogen is found in the Earth's atmosphere, where it makes up about 78% of the air by volume.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.