According to Einstein's equation E=mc^2, energy (E) is equal to mass (m) multiplied by the speed of light (c) squared. This equation demonstrates the equivalence between mass and energy. It shows that mass can be converted into energy and vice versa.
In principle, it is possible to convert mass into energy, as demonstrated by nuclear reactions such as nuclear fission and fusion. These reactions involve the conversion of a small amount of mass into a large amount of energy. The energy released in these reactions is a result of the conversion of mass according to the equation E=mc^2.
However, it is important to note that the complete conversion of any given mass into energy is not practically achievable with current technology. The conversion of mass into energy requires extremely high energy densities and specific conditions, typically found in nuclear reactions or particle physics experiments.
In everyday situations, the mass-energy equivalence is not directly observable or applicable on a significant scale. It is mostly relevant in the context of nuclear processes, particle physics, and cosmology.