d031b852_ध_रस_यन___क__स_च____व_क_प_ड_य___Source_and_description
[Chemical name] nitrogen [Chemical formula] N2 [Common or alternative name] liquid nitrogen [Source and description] 
Hospital, laboratory, university, welding supply house, and industrial gas supplier can all provide liquid or gaseous nitrogen.
सरलता से उपलब्ध रसायनों की सूची - विकिपीडिया