Are particles some kind of energy instead of an actual substance that we commonly consider and does Einsteins' famous Mass- Energy Equivalence mean energy has a certain multiples of mass or energy can?

Answer 1

One of the findings of quantum mechanics is that as we look at the world on an increasingly small scale, the distinction between matter and energy, or between particles and waves, becomes increasingly blurred. Some physicists have used the word "wavicles" to describe this intermediate state between particles and waves. It is also true that energy exists in certain discrete amounts, or quanta, and you cannot have a fraction of a quantum.