Question

two examples where law of conservation of mass doesn't hold good

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Answer 1

The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases, equals the original mass of the charcoal and the oxygen when it first reacted.

Answer 2

From the equation (9.14), pressure is equal to 2/3 of mean kinetic energy per unit volume.