vivek80437
Plaster of Paris. mid-15c.; originally it was made from the extensive gypsum deposits of Montmartre in Paris. Any of a group of gypsum cements, essentially hemihydrated calcium sulfate, a white powder that forms a paste when mixed with water and hardens into a solid, used in making casts and molds.
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RahulSinghh
Plaster of paris is made by heating gypsum in large steel pots at about 373 K
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