Why is calcium sulphate hemihydrate called plaster of Paris?
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because it is formed by gypsum which first found in Paris .gypsum heat to 100' C to form plaster.
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Plaster of paris, quick-setting gypsum plaster consisting of a fine white powder (calcium sulfate hemihydrate), which hardens when moistened and allowed to dry. Known since ancient times, plaster of paris is so called because of its preparation from the abundant gypsum found near Paris.
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