A consequence of the mass energy equivalence is that if a body is stationary, it still has some internal or intrinsic energy, called its rest mass is also called the intrinsic or invariant mass because it remains the same regardless of this motion, even for the extreme speeds or gravity considered in special and general relativity.
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In 1932, Frederick Rossini, Edward W . Washburn, and Mikkel Frandsen authored The Calorimetric Determination of the Intrinsic Energy of Gases as a Function of the Pressure . This experiment resulted in the development of the Washburn Correction for bomb calorimetry, a decrease or correction of the results of a calorimetric procedure to normal states.
