Question

Urgent!!POP that doctors use turns to gypsum but y do we call them POP?I think plasters that doctors use comes in contact with atmosphere and becomes hard(gypsum).Is that right?

Answer 1

Plaster is the common name for calcium sulphate hemi hydrated made by heating gypsum. plaster was first made about 9000 years ago and has been used by ancient Egyptian, Greek, and Roman civilizations. However it was not used on large scale until 1700s, when it was required to be used in. all construction in Paris. in 1666, a fire raged across London, destroying many parts of it. hence king of France orders that all walls made of wood in Paris be immediately covered with plaster as a protection against such fires. this resulted in large scale mining of gypsum which was available in huge quantities in Paris. thus, during 28 the century , Paris became centre of plaster production and hence name plaster of Paris.