Why plaster of paris kept in a tight container?

1.	Why plaster of paris kept in a tight container?
Answer» Pop is kept in a tight container so that it doesn\'t react with moisture...as when it reacts with moisture it converts into gypsum Because they are stored in the moisture proof container Plaster of Paris in contact with moisture (water) changes to solid hard mass, gypsum. Therefore, it gets wasted. Hence it should be stored in moisture proof containers. So that it could not be converted into gypsum

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