Nitrogen is considered a constant gas because what is added to the atmosphere is balanced by what is removed through precipitation and various biological processes.

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Nitrogen is considered a constant gas because the amount added to the atmosphere through processes such as nitrogen fixation is balanced by the amount removed through precipitation and various biological processes such as denitrification. This means that the amount of nitrogen in the atmosphere remains relatively stable over time.

Nitrogen Is Considered a Constant Gas Because What Is Added