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Physical changes involve the conservation of mass, while energy is a conserved quantity following the principle of conservation of energy.
In physical changes, the conservation of mass is always observed. This means that the total mass, the number of atoms, and the number of molecules remain the same before and after the change. Energy changes may occur during physical changes but are typically smaller compared to chemical changes.
Energy is a conserved quantity in the universe and follows the principle that it cannot be created or destroyed, only transformed from one form to another. This principle, known as the conservation of energy, is a fundamental concept in physics and plays a crucial role in understanding various interactions and phenomena.
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