Emptiness defined by the Buddha is not something achieved through a process of transformation. Neither can the notion of energy (an existent phenomenon) becoming emptiness be accepted according to the law of the conservation of energy. Even if it were to be accepted, the derivation of such conclusion would not correspond to Buddhist’s idea of emptiness.

Actually, real emptiness does not mean matter disappears into thin air; rather, matter and emptiness exist simultaneously. This is the definition of emptiness given by the Buddha.

~ Depicted from THE RIGHT VIEW : Buddhism - The Definition