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A steam engine is a machine that uses steam pressure and heat to create mechanical motion. It was the first machine that could convert thermal energy into mechanical energy while being practical and convenient.

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Steam Engine Definition, History & Impact - Lesson | Study.com
What is a Steam Engine? A steam engine is a machine that uses heat and steam pressure to create mechanical motion. The steam engine was the first machine capable of converting thermal energy to mechanical energy while being convenient and practical. Historically, the steam engine is associated with the Industrial Revolution, a period when new manufacturing processes were developed in Britain, continental Europe, and the United States. Additionally, the steam engine was widely used in industry and transportation throughout the 19th century.
Here's how a steam engine works:
Steam pressure creates a force that pushes a piston back and forth inside a cylinder.
A connecting rod and crank transforms this pushing force into rotational force for work.
Steam engines were the driving force behind the Industrial Revolution. They were used to power the first trains, ships, factories, and cars. The steam engine provided a reliable and consistent source of power, enabling factories to increase production and scale their operations exponentially.
Steam engines were invented by several individuals throughout history, with each contributing to its development and improvement.
Some disadvantages of steam engines include:
In the low-pressure range, they were less efficient than condensing engines.
They were more susceptible to boiler explosions.