Feet of Clay (Terry David John Pratchett) читать бесплатно онлайн полную версию книги

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Terry used this joke in a talk at the Australian National University in Canberra in 1994, but he was talking about a shift charge engineer in a nuclear power plant…

The standard analytical technique to prove arsenic in chemical mixtures involves mixing the sample with zinc and adding sulphuric acid. If arsenic is present, this produces arsenic hydride as a gas; burning the gas, and holding the flame against a cool porcelain surface, leaves a black precipitation of metallic arsenic.