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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.
1 Ammonia has alkaline properties and is corrosive. 2  Ammonia gas dissolves easily in water to form ammonium hydroxide, a caustic solution and weak base. 3  Ammonia gas is easily compressed and forms a clear liquid under pressure.4  Ammonia is usually shipped as a compressed liquid in steel containers.ome 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.