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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site ammonia A colorless, pungent, gas (NH3) that is extremely soluble in water and may be used as a refrigerant. It is also a fixed form of nitrogen that is suitable as fertilizer. For more on ammonia, see the ammonia entry in the Encyclopedia of Science. Related categories    • MATERIALS AND MATERIALS SCIENCE Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP