A thickcoating of Plaster of Paris (POP) paste is applied over the bandageon a fractured bone. It becomes hard on drying to keep the fracturedbone immobilized. Can the change in POP be reversed?

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Solution

Whenwater is added to plaster of Paris (POP),it changes to another substance and on drying it hardens. Once thePOP has hardened, its shape cannot be changed. Therefore, the changein POP cannot be reversed.

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