Nitrogen 6 : Inert, colourless and odourless gas. About 80% of the atmosphere is N2. Used as a neutral filler in filament lamps, in sealed relays, high-voltage cables as an insulant. Liquid nitrogen is used as a coolant
H. J. Porter (Chairman - Technical Committee), Dictionary of Fire Technology, The Institution of Fire Engineers, The Victory Press (Leicester) Ltd. 1979 UK. (Fr Tech - Brit) {81}