Einstein's mass-energy equivalence

Einstein's mass-energy equivalence means that mass and energy are interchangeable; they are different forms of the same thing. This idea is expressed by the famous formula E=mc², where E is energy, m is mass, and c is the speed of light. Essentially, a small amount of mass can be converted into a massive amount of energy, which explains phenomena like nuclear reactions. This concept shows that mass isn’t just a measure of matter but also a form of stored energy, revealing a deep connection between the physical properties of objects and their energetic potential.