Question

Does the analogous saying: “matter is essentially 'condensed' energy” have any merit?

Answer 1

Einstein in his derivation of special relativity came upon the equivalence of energy and matter, and given the right circumstances, the relation can go either way - matter can become energy, and energy can become matter - right?

So my question relates to the second process - energy becoming matter.

While I know energy does not literally condense into matter in the sense that steam condenses into water, by analogy does the (rather loose) saying:

Answer 2

Explanation:

You can define any mass by a distance known as its Schwarzschild radius, which is the radius of a black hole of that mass