Nitrogen,oxygen and methane are all permanent gases.

Name: Nitrogen,oxygen and methane are all permanent gases.
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Quizplus · Accepted Answer

Nitrogen and oxygen are considered permanent gases in the atmosphere because they remain gases under a wide range of temperatures and pressures. Methane, however, is not considered a permanent gas because it can condense into a liquid at lower temperatures or under higher pressure conditions.

Nitrogen,oxygen and Methane Are All Permanent Gases