Question

why do pop lnown as plaster of paris??

Answer 1

Because, Plaster of Paris (POP) isobtained by heating calcium sulphate hemi hydrate, also referred as gypsumfor about 140-180 degree Celsius. The name Plaster of Paris (POP) is derived as the calcium sulphate hemi hydratesare found in large amount deposited in the Montmartre hill in Paris.
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Answer 2

The name Plaster of Paris (POP) is derived as the calcium sulphate hemi hydrates are found in large amount deposited in the Montmartre hill in Paris.