what are two main properties of plaster of paris ? answer in 30 words (Then I swear I will definatly mark you as a brainlist)
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they are used in plastering of bones
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It is a white powder. When mixed with water (1/3 of its mass), it evolves heat and quickly sets to a hard porous mass within 5 to 15 minutes. During setting, a slight expansion (about 1%) in volume occurs so that it fills the mould completely and takes a sharp impression.
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