Ammonia is a compound of nitrogen and hydrogen with the formula NH3. It is normally a gas but can also be a liquid or solid when under high pressure or at a low temperature. The toxic atmosphere on P3X-289 was made up of Ammonia, Sulfur dioxide, Carbon monoxide and Methane. (SG1: "Revisions")
High concentrations of frozen ammonia, along with several other toxic chemicals, was found mixed within the ice near the Stargate on Hoth. (SGU: "Water")
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