Urea, also known as urea or carbamide, has the chemical formula CH4N2O or CO (NH2) 2. It is a white crystal, odorless and tasteless, easily soluble in water, ethanol, and benzene, and slightly soluble in ether and chloroform. Urea is one of the simplest organic compounds and the main nitrogen-containing end product of protein metabolism and decomposition in mammals and certain fish. It can be used as a fertilizer, animal feed, explosive, glue stabilizer, and chemical raw material. Because this substance is present in human urine, it is named urea. As a neutral fertilizer, urea is suitable for various soils and plants. It is easy to store, convenient to use, and has little destructive effect on soil. It is a type of chemical nitrogen fertilizer that requires a large amount of use. Urea contains 46% nitrogen (N), which is the highest nitrogen content among solid nitrogen fertilizers. In industry, urea is synthesized using ammonia and carbon dioxide under certain conditions. Material coexistence. In terms of medicine and other aspects.

Prve：Synthetic ammonia (liquid anhydrous ammonia)
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