AMMONIA (Anhydrous). Gas usually carried by LPG tankers at about -50 deg.c. Lighter than air, it is easily escaping from any openning and be highly dangerous to inhale in great uantity. Reacting violently with water. All degrees centigrade: Boiling point: -33, Melting point:-78, Auto-ignition:630. Molecular weight: 17, Flammable range: 15-26pc.