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one distinct vapor, steam, is the result of water being heated to and beyond the temperature of two hundred twelve (212) degrees fahrenheit... when this reaction occurs within a closed container, pressure is increased and can force the walls of that container to expand, break apart, or move (if the container is properly constructed); in the case of the container with one movable wall, that describes the general dynamic of what is known as a piston, most famously observed in use for propulsion of the 'steam locomotive'... steam in this example actually is 'kinetic' energy which demonstrates the 'potential' energy inherent in unheated, and motionless water...

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