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Due to the mummy’s sarcophagus not being tightly secured, this created an open system. In open systems, matter can both enter and escape.
The mummy’s sarcophagus had a chemical reaction with the air. Thus, causing the mummy’s overall mass to decrease.
The system which can exchange both matter and energy with surroundings is called an open system.
An open system may appear to violate conservation laws because it can gain or lose matter and energy.
The above explanatory note has described well about how the mummy and the sarcophagus decreased in mass even though the law of conservation of mass is obeyed.
Learn more about open system , here:
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