Wiki User High School/Campus/Freshman Classes/Chemistry/Test/Raiku

Over the years, one thing scientists have discovered is that nature is generally more complex than we give it credit for. The following laws of physics are considered fundamental, but many of them refer to idealized, closed systems, which are hard to obtain in the real world. Also, some are altered slightly in different circumstances. Newton's laws of motion, for example, are modified by the findings of the theory of relativity, but they are still basically valid.

The total energy in a closed or isolated system is constant, no matter what happens. Another law stated that the mass in an isolated system is constant. When Einstein discovered the relationship E=mc2, in other words that mass was a manifestation of energy, the law was said to refer to the conservation of mass-energy, which says the total of both is retained, although some may change forms. The ultimate example of this is a nuclear explosion, where mass transforms into energy.