Assertion Mass and energy are not conserved separately, but...

Assertion Mass and energy are not conserved separately, but are conserved as a single entity called 'mass-energy'. Reason This is because one can be obtained at the cost of the other as per Einstein equation.
$$
E=m c^{2}
$$

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Key Concepts

Einstein's Equation (E = mc²)

Einstein's equation, E = mc², quantifies the relationship between mass and energy, indicating that a small amount of mass can be converted into a huge amount of energy due to the squared factor of the speed of light. This equation not only lays the mathematical foundation for mass-energy equivalence but also underpins critical phenomena in nuclear physics, astrophysics, and other areas where mass-energy conversion is evident.

Mass-Energy Equivalence

Mass-energy equivalence is the foundational principle that mass and energy are interchangeable and represent two facets of a single physical entity. This concept, pivotal to modern physics, fundamentally changes our understanding of conservation laws by showing that mass can be converted into energy and vice versa, thereby uniting two seemingly different quantities into one conserved whole.

Conservation of Mass-Energy

The conservation of mass-energy extends the traditional idea of conservation laws to encompass both mass and energy in a unified framework. It asserts that while mass and energy might appear to change forms during physical processes, the total combined amount of mass-energy remains constant, ensuring a consistent balance in all physical interactions.

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