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Ammonia is a colourless gas with a characteristic pungent smell. It is lighter than air, its density being 0.589 times that of air. It is easily liquefied due to the strong hydrogen bonding between molecules; the liquid boils at â33.3 Â°C (â27.94 Â°F), and freezes at â77.7 Â°C (â107.86 Â°F) to white crystals.
Some chemical/physical properties of ammonia are: 1  At room temperature, ammonia is a colorless, highly irritating gas with a pungent, suffocating odor. 2  In pure form, it is known as anhydrous ammonia and is hygroscopic (readily absorbs moisture).3  Ammonia has alkaline properties and is corrosive. Ammonia gas dissolves easily in water to form ammonium hydroxide, a caustic solution and weak base. 2  Ammonia gas is easily compressed and forms a clear liquid under pressure. 3  Ammonia is usually shipped as a compressed liquid in steel containers.