Uses Of Nitrogen by keypoint Liquid nitrogen is used as a cooling agent. It is used as a carrier gas in gas chromatography due to its inert nature. It constitutes part of producer gas, which is an important fuel gas. It is used in haber process for manufacturing ammonia. Others are Viewing: Nitrogen Physical Property Of Nitrogen Chemical Properties Of Nitrogen Oxides Of Nitrogen Nitrogen (II) Oxide (NO) Test For Nitrogen (ii) Oxide Nitrogen (IV) Oxide NO2