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Plaster of Paris gets hot when mixed with water due to an exothermic chemical reaction. When water is added, the gypsum (calcium sulfate dihydrate) in plaster of Paris reacts to form calcium sulfate hemihydrate, releasing heat in the process. This heat generation is a result of the energy released as the chemical bonds rearrange during the hydration reaction. The heat can sometimes be intense enough to cause burns, so care should be taken when using it.

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1mo ago

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