NOVELTY - Producing ammonia from air and water involves: (A) producing nitrogen gas from air by pressure-swing-adsorption; producing hydrogen gas by electrolysis of water; (B) compressing nitrogen gas in first cylinder to produce pressurized nitrogen gas; (C) compressing hydrogen gas in second cylinder to produce pressurized hydrogen gas; (D) compressing mixture of pressurized nitrogen and hydrogen gases in third cylinder; (E) heating compressed mixture in presence of catalyst to react nitrogen and hydrogen to form ammonia; and (F) extracting ammonia from mixture.    USE - For producing ammonia from air and water (claimed).    ADVANTAGE - In the method for producing ammonia from air and water air is converted to ammonia by extracting nitrogen from air and generating hydrogen from water, and then reacting nitrogen and hydrogen under high pressure to form ammonia. The main by-product of the process is oxygen. Whereas typically ammonia is produced in processes involving conversion of organic materials, such as natural gas (methane) or petroleum products; in which such processes produce environmentally un-friendly materials. Thus, in the production of ammonia from air and water the process produces no carbonaceous pollutants.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a system (100) for producing ammonia from air and water comprising: a pressure-swing-adsorption (PSA) nitrogen generator (102) for extracting nitrogen gas from air; a hydrogen generator (116) comprising an electrolysis cell for producing hydrogen gas from water; a first piston-cylinder gas compressor (104) connected to the nitrogen generator for receiving and compressing the nitrogen gas to produce pressurized nitrogen gas; a second piston-cylinder gas compressor (112) connected to the hydrogen generator for receiving and compressing the hydrogen gas to produce pressurized hydrogen gas; a reactor connected to the first and second cylinder gas compressors to receive the pressurized nitrogen and hydrogen gases, and comprising a third piston-cylinder gas compressor (108) for further compressing a mixture of the pressurized nitrogen and hydrogen gases, a heater for heating the mixture in the third compressor, and a catalyst (136) in the third compressor for catalyzing a reaction of nitrogen and hydrogen in the mixture to form ammonia; a gas separator (120) for separating ammonia from gases received from the reactor, comprising an inlet connected to the reactor for receiving the gases from the reactor, a first outlet connected to the reactor for circulating the gases back to the reactor, and a second outlet for outputting the ammonia.    DESCRIPTION OF DRAWING(S) - The figure shows the ammonia production system.    Ammonia production system (100)    Pressure-swing-adsorption nitrogen generator (102)    Piston-cylinder compressor to compress nitrogen (104)    Compression pistons (106, 110, 114)    Piston-cylinder compressor to compress mixture of nitrogen and hydrogen (108)    Piston-cylinder compressor to compress hydrogen (112)    Electrolysis cell/hydrogen generator (116)    Coiled equilibrium loop (118)    Ammonia separator (120)    Storage tank (122)    Catalyst bed (136)