Nitrogen
Nitrogen constitutes 78% of the atmosphere by volume. It is a "permanent gas", colorless, tasteless, odorless, and non-combustible. N2, very inert in the free state and incapable of supporting life, is intensely cold in a liquid state. One volume of liquid nitrogen gives approximately 700 volumes of gas at ambient conditions. This gas forms many important compounds, such as ammonia, nitric acid, the cyanides, etc, and is a constituent of all organized living tissues, animal or vegetable.
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