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The definition of steam is using water vapor. An example of steam used as an adjective is in the phrase steam engine, which means an engine that runs on water vapor. noun Steam is a vapor, particularly water heated to the boiling point and then converted to a vapor or gas.
A steam engine is a machine that burns coal to release the heat energy it containsâso it's an example of what we call a heat engine. It's a bit like a giant kettle sitting on top of a coal fire. The heat from the fire boils the water in the kettle and turns it into steam.hoto: Close-up of the piston and cylinder in a steam engine. Our diagram up above shows a very simple, one-cylinder steam engine powering a steam locomotive down a track. This is called a rotary steam engine, because the piston's job is to make a wheel rotate.