Question

wt is meant by E= mc2​

Answer 1

Energy equals mass times the speed of light squared." On the most basic level, the equation says that energy and mass (matter) are interchangeable; they are different forms of the same thing. Under the right conditions, energy can become mass, and vice versa.

Answer 2

The energy released in both Nuclear fission and fusion the loss in mass gets converted into energy in accordance with the Einstein's mass energy relation e=mc2 ... This energy is used in nuclear reactors