Why does plaster of paris get warm while it's drying?
- naturalplasticsLv 41 decade agoFavourite answer
it's because of a pozzalonic reaction.
Plaster of paris is partially dehydrated gypsum. When water is added, it eventually becomes absorbed into the mineral, and returns to gypsum. This mild recrystalization releases energy because gypsum is more stable when fully hydrated, so there is a release of energy.
- the old dogLv 71 decade ago
Because the chemical reaction to the water is actually creating heat in the process of solidifying.
- justbeingherLv 71 decade ago
It's called an exothermic reaction. Concrete does the same thing when it's setting and throwing off the excess water.
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- billyLv 61 decade ago
Its a chemical reaction and causes heat, cement does the same thing.
- Anonymous1 decade ago
some chemical reaction im not sure