ammonia 你了解多少？ 大家都在合成氨行业做了很久,氨,你了解多少.耐心,慢慢看下去 ammonia or azane is a compound of nitrogen and hydrogen with the formula nh3. it is a colourless gas with a characteristic pungent smell . ammonia contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to food and fertilizers . ammonia, either directly or indirectly, is also a building-block for the synthesis of many pharmaceuticals and is used in many commercial cleaning products. although in wide use, ammonia is both caustic and hazardous . the global production of ammonia for 2012 is anticipated to be 198 million tonnes, [7] a 35% increase over the estimated 2006 global output of 146.5 million tonnes. [8] ammonia, as used commercially, is often called anhydrous ammonia. this term emphasizes the absence of water in the material. because nh3 boils at −33.34 °c (−28.012 °f) at a pressure of 1 atmosphere, the liquid must be stored under high pressure or at low temperature. "household ammonia" or " ammonium hydroxide " is a solution of nh3 in water. the concentration of such solutions is measured in units of the baumé scale ( density ), with 26 degrees baumé (about 30% w/w ammonia at 15.5 °c) being the typical high-concentration commercial product. [9] household ammonia ranges in concentration from 5 to 10 weight percent ammonia. 查看更多
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