E=mc² (formula)

E=mc² is a formula by Albert Einstein that expresses the relationship between energy (E), mass (m), and the speed of light (c). It states that mass can be converted into energy, and vice versa. Here, c² (the speed of light squared) is a large number, which means even a small amount of mass can generate a huge amount of energy. This principle underlies many physical processes, including nuclear reactions, where tiny amounts of mass are transformed into substantial energy, highlighting the deep connection between matter and energy in the universe.