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?

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?

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