Hello, can you please clarify my understanding of the Einstein equation E=mc2 This means the total energy in an objects volume? m*<c*c> Would the result be in Joules? Considering a cup, maybe volume is not the correct word . An objects solidity? P.s - I have got to ask sorry, how much of this energy from an object is lost to the gravitational constant? Or by entropy means does it stay at an equilibrium of E=mc2?