I have reread and nothing changes, I said mass cannot come from nothing.
@Subduction Zone wrote matters, not masses.
masses and energies are interconvertable, as they are equivalence to each other…and these 2 are properties of matters.
Now, while mass can be converted into energy, and energy into mass, it might not always reverse convert into the same types of mass it was before.
Do you understand that?
The standard model in particle physics, expressed most of the fundamental & elementary particles, and except with gluons & photons, each of these particles have very specific measurements of their respective masses.
And here is what you’d need to understand about quantum mechanics and quantum fields, is the unpredictable nature when dealing world at quantum level, the energy conversion might not reverse convert exactly to the same mass as it was before. Meaning there are no guarantees that it would convert exactly back to the masses of quarks (eg up & down quarks), quarks which building blocks of atoms, and therefore of MATTERS.
The point is that only stated that matters can be made from non-matters.
While the quarks are building blocks of protons and of neutrons, a single quark isn’t a matter. It required composite of 2 different types of quarks (up quarks & down quarks), but there needs to be 3 quarks to form either a proton or neutron.
But there are also chance, that energy might convert into other different types of particles, that because of unpredictable nature of the quantum world. As I said, quarks may the building block of matter, but proton and neutron are made of 3 quarks each. By them, if the quarks are not by strong nuclear force, these individual and separate quarks are not matters.
While hadron particles require 3 quarks. Mesons only require 2 quarks - a quark & its antiquark.
And I think I have just fried my brain.
anyway, non-matters don’t mean nothing. You are confusing 2 different words, and you thinking they means the same things.