Question

why plaster of Paris is called so?

Answer 1

Because, Plaster of Paris (POP) is obtained by heating calcium sulphate hemi hydrate, also referred as gypsum for about 140-180 degree Celsius. 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.

Answer 2

It is also called so as it is made by heating the Gypsum for about 140-180 degrees
Gypsum is found in large amount in Montmartre Hill in Paris..