This theory implied several assertions like the idea that internal energy of a system could contribute to the mass of the whole system or that mass could be converted into. Or the general definition is. Law Of Conservation Of Mass Vector Illustration Labeled Educational Scheme With Substance Example Exp Conservation Of Mass Science For Kids Chemistry Lessons In other words the mass of any one element at the. . The total energy of an isolated system. Law of Conservation of Mass Examples Combustion process. The total mass stays the same during a chemical reaction. The law of conservation of mechanical energy states that The total mechanical energy of a system remains constant if the internal forces are conservative and the external forces do no work. See OML Declination 1-27-14 Sturbridge Conservation Commission. The law of conservation of mass was challenged with the advent of special relativity. Another wa