Nitrogen is colourless, odourless, and tasteless gas. It is non
flammable and will not support combustion. Atmospheric air
contains 78.09% nitrogen, the gas is slightly lighter than air
and slightly soluble in water.
Nitrogen condenses at its boiling point , -195°c to a colourless and odourless liquid that is lighter than water. When liquid nitrogen is vaporized and than heated to ambient temperature , it absorb a large quantity of heat.
Nitrogen is separated from air, by distillation, absorption of diffusion.