Abstract: This invention relates to the production of engines based on a new physical principle in which the engines will extremely quickly change the physical state of fluids or solids, especially the substances with low boiling points such as liquid water, liquid nitrogen, CO2 powder, in which the outputted mechanical energy is significantly greater than the inputted energy to operate the engine. The engine is called engine for dispersing matter into the surrounding space in order to produce mechanical energy, or in short, matter-dispersing engine. At the same time, this invention also relates to the production of engines based on the concept of extremely quickly changing of matter (or high-speed dispersion of matter into the surrounding space) with the result that the elements being changed their physical states in the engine will move at a great positive acceleration and apply to members of the engine and generate great amount of mechanical energy.