Because of its many uses,<unk>  is one of the most highly-produced inorganic chemicals. There are literally dozens of large-scale<unk>  plants worldwide. The worldwide<unk>  in 2004 was 109,000,000 metric tons. China produced 28.4% of the worldwide<unk>  followed by India with 8.6%, Russia with 8.4%, and the United States with 8.2%. About 80% or more of the<unk>  produced is used for fertilizing agricultural crops.<unk>  is also used for the<unk>  of plastics, fibers, explosives, and intermediates for dyes and pharmaceuticals.
Ammonia production
Oxygen permeability
Flux 
Electrochemical gradient
Blood flow
Osmolarity
Ethanol fermentation
Oxygenation