When a substance is heated and leads to increase in volume of particles , the mass of the substance being heated stays same.
The Law of conversation of mass asserts that the mass remain the same during heating or chemical reaction.
In other word, the law states that a mass in an isolated system will neither be created nor destroyed by chemical reactions or physical transformations.
In conclusion, when a substance is heated and leads to increase in volume of particles , the mass of the substance being heated will stays same.
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