Define plaster of Paris and gypsum
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Plaster Of Paris, Baking Soda and Washing Soda. Plaster of Paris is obtained by heating gypsum. The chemical formula of plaster of Paris is CaSO4. 1/2H2O. Plaster of Paris is a white powder and on mixing with water it changes to gypsum resulting in a hard solid mass.
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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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