nope, not sure i can explain it any more clearly. rockets never did work by pushing against air. the mass of the exhaust pushes against the mass of the rocket. this balls out physics guy is misleading you. try finding every other video you can on 3rd law stuff and watch them. you'll get it. it is nothing to do with pushing against the atmosphere. in space or not in space.
nope, not sure i can explain it any more clearly. rockets never did work by pushing against air. the mass of the exhaust pushes against the mass of the rocket. this balls out physics guy is misleading you. try finding every other video you can on 3rd law stuff and watch them. you'll get it. it is nothing to do with pushing against the atmosphere. in space or not in space.