What is another word for mass-energy equivalence?
Pronunciation: [mˈasˈɛnəd͡ʒi ɪkwˈɪvələns] (IPA) 
Mass-energy equivalence refers to the scientific concept that states that mass and energy are two interchangeable forms of the same thing. This notion is best known through Albert Einstein's famous equation of E=mc², which showcases the relationship between mass and energy. There are several other synonyms that can be used to refer to this concept. These include energy-mass interchangeability, equivalence of mass and energy, mass-energy transformation, and matter-energy conversion. All of these synonyms essentially mean the same thing, which is that mass can be converted into energy and vice versa, and that both are different forms of the same fundamental entity.
