Written by the Fiveable Content Team โข Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examโขWritten by the Fiveable Content Team โข Last updated September 2025
Definition
E=mc^2 is Einstein's famous equation that relates energy (E) to mass (m) and the speed of light (c). It states that energy is equal to mass multiplied by the square of the speed of light.
Related terms
Mass-energy equivalence: This term refers to the concept that mass and energy are interchangeable, as described by E=mc^2.
Special theory of relativity: This theory developed by Einstein explains how time, space, and motion are relative depending on an observer's frame of reference.
Nuclear reactions: These reactions involve changes in atomic nuclei and release large amounts of energy through processes such as fission or fusion.