One truly elegant hypothesis of physics is the "zero-energy universe" hypothesis. It proposes that the net sum of the energy in the universe perfectly equates to zero. According to the idea, if ...

This is because melting the ice has not created or destroyed any atoms and the mass has stayed the same. This is known as the law of conservation of mass. It applies to both chemical reactions and ...

Just as, for example, in ordinary mechanics, the law of conservation of energy is fulfilled. However, this assumption is not always justified. For example, at sufficiently high energies the so ...