Even though the meaning is always the same, the law of conservation of energy can be stated in many different ways. Examples are: the total energy of an isolated system remains consistent; energy cam be neither created nor destroyed; in the changing from one form to another, energy is always conserved.

The conservation if energy, as stated above: The total energy of an isolated system remains constant. Thus, even though energy may be changes from one form to another, energy is not lost from the system. A system is something wrapped up within boundaries, which may be real or imaginary, and isolated means that nothing from the outside affects the system ( and vice versa).

For instance, the student in a classroom might be considered a system. The student may move around in the room, but if no one left or entered, the number of students would be conserved ("law of conservation of students"). We often say that the total energy of the universe is conserved. That is, the universe is the largest isolated system we can think of, and all the energy in the universe is somewhat in the some form.

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