Understanding Einstein's Famous Formula: E=mc2 and Its Significance Explained

[AfRoMaNn]

im pretty sure everyone's familiar with einsteins formula E=mc² but what is this formula for? E²=m²c⁴

 

[bcrowell]

It's the same equation but with both sides squared. It's like 7E=7mc² -- not an independent piece of information.

 

[Janus]

Who might be thinking of the formula

$$E^2 = p^2c^2+m^2c^4$$

$$E=mc^2$$ is fine for determining the energy equivalent for the rest mass of a particle. The formula above is more general as it also includes the momentum of the particle and also works for the photon, which has no rest mass.