Anhydrous Ammonia The Anhydrous Ammonia we offer are used in the production of nitrogen fertilizer Our Company can provide Anhydrous Ammonia in bulk quantities such as in 50 Kg cylinders As we find these from reliable and trusted partners Physical Constants of Anhydrous Ammonia Molecular symbol NH3 Molecular weight 17 032 Boiling point at one atmosphere -28 F Freezing point at one atmosphere -108 F Critical temperature 270 32 F Critical pressure 1657 psig Vapor density at -28 F and one atmosphere 0 056697 lb cubic ft He/Sheat of Combustion 8001 BTU lb