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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.
Ammonia toxicity. Ammonia toxicity: Introduction. Ammonia toxicity: At room temperature, ammonia (NH3) is a highly water-soluble, colourless, irritant gas with a unique pungent odour. See detailed information below for a list of 14 causes of Ammonia toxicity, including diseases and drug side effect causes.