Question

why is calcium sulphate hemihydrate called plaster of paris?

Answer 1

Bcoz it was first discovered in paris

Answer 2

Plaster of Paris is obtained by heating gypsum or calcium sulphate dihydrate to about 140-180 degree Celsius. When heated to such a temperature, gypsum forms Plaster of Paris. The name is derived from the large deposits of gypsum in the Montmartre hill in Paris.