Why does plaster of paris get warm while it's drying?

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  • 1 decade ago
    Favourite 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.

  • bogen
    Lv 4
    4 years ago

    Why Does Plaster Get Hot

  • 1 decade ago

    Because the chemical reaction to the water is actually creating heat in the process of solidifying.

  • 1 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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  • billy
    Lv 6
    1 decade ago

    Its a chemical reaction and causes heat, cement does the same thing.

  • Anonymous
    1 decade ago

    some chemical reaction im not sure

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