Mass-energy

The mass-energy equivalence principle shows that mass is a concentrated form of energy, represented by the equation e=mc^2. This extended the law of conservation of energy to include mass as another form of energy, and is sometimes known as the law of conservation of mass-energy.
 Albert Einstein Switzerland 1905 Mass-energy

The mass-energy equivalence principle shows that mass is a concentrated form of energy, represented by the equation e=mc^2. This extended the law of conservation of energy to include mass as another form of energy, and is sometimes known as the law of conservation of mass-energy.