Abstract: Disclosed is a thrust-producing device that can generate force in any medium (in air, in space, underwater). The device, in and of itself, does not have an external intake, or exhaust. Thrust is produced when electro-mechanical and/or thermal energy is applied to a closed, pressurized container of gas so as to produce an imbalance in the internal pressure within the container. A measure of corrosion prevention can be achieved by using N2, an inert gas, or some other gas that will not chemically react with the other constituents in the container. Although this invention was principally intended as an advancement in the field of space propulsion systems, it has wide applicability across all modes of transportation; and has applications in stability and control, as well as propulsion.