Mass-energy equivalence
In physics, mass–energy equivalence is the concept that the mass of an object or system is a measure of its energy content. For instance, adding 25 kilowatt-hours (90 megajoules) of any for...
Mass-energy equivalence - Wikipedia
Einstein's Theory of Relativity Explained (Infographic)
Albert Einstein's General Theory of Relativity celebrates its 100th anniversary in 2015. See the basic facts of Einstein's relativity in our infographic here.
Electromagnetic mass
Electromagnetic mass was initially a concept of classical mechanics, denoting as to how much the electromagnetic field, or the self-energy, is contributing to the mass of charged particles. It was fir...