Noun
the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes
Source: WordNetBy the middle of the nineteenth century, it was recognized as a form of energy, and the law of conservation of energy was thereby also recognized. Source: Internet
First, the law of conservation of energy says that energy is conserved within each universe. Source: Internet
When the thermal energy is equivalent to the work done, this does not violate the law of conservation of energy. Source: Internet
There is also a global law of conservation of energy, stating that the total energy of the universe cannot change; this is a corollary of the local law, but not vice versa. Source: Internet