https://en.wikipedia.org/wiki/PropellantA propellant or propellent is a chemical substance used in the production of energy or pressurized gas that is subsequently used to create movement of a fluid or to generate propulsion of a vehicle, projectile, or other object. Common propellants are energetic materials and consist of a fuel like gasoline, jet fuel, rocket fuel,
and an oxidizer. Propellants are burned or otherwise decomposed to produce the propellant gas. Other propellants are simply liquids that can readily be vaporized.
In rockets and aircraft, propellants are used to produce a gas that can be directed through a nozzle, thereby producing thrust. In rockets, rocket propellant produces an exhaust, and the exhausted material is usually expelled under pressure through a nozzle. The pressure may be from a compressed gas, or a gas produced by a chemical reaction. The exhaust material may be a gas, liquid, plasma, or, before the chemical reaction, a solid, liquid, or gel. In aircraft, the propellant is usually a fuel and is combusted with the air.
So what your talking about is "usually" and pretending its "always" .
As in : Bob "usually" has sex with his wife.
Compressed 0² and 0³ technology is already in use, keep living in your '50s combustion cave, cough cough.
Oh look, you glossed over it. Again. In your very own post. The word "AND" is really super-duper important here. Propellant is fuel AND oxidizer.
Card argues Card.