How a Steam Engine Works

How a Steam Engine Works. . The steam engine had a dramatic impact on the development of transportation and industry in the 19th century. Indeed, it was the steam engine that powered the industrial revolution., How does a steam engine work? The principal is simple. Water heated to the boiling point turns to steam. By its nature, the steam expands and takes up more space that the water. When the steam is confined to a small space, pressure builds up. If the pressurized steam is released into a cylinder with a piston, the steam can move the piston back and forth. Attach the piston to wheels and it can power machinery or a locomotive!, . High pressure steam leaves the boiler and enters the engine. , . A slide valve allows steam to enter each side of the piston alternately. , . The steam moves the piston back and forth. , . The piston is attached to a piston rod. , . The piston rod is attached to a cross head which controls the movement of the piston. , . The cross head is attached to a drive rod and a connecting road to drive the locomotives wheels. , . Steam is released in bursts through the exhaust stack and makes a “choo-choo” sound as it exists.