Did James Watt invent the first steam engine?

James Watt did not invent the first steam engine. While he is often associated with the technology, his primary contribution was significantly improving the efficiency of existing designs.12

The history of steam power dates back to the 1st century CE with the aeolipile created by Heron of Alexandria. By the 17th and early 18th centuries, practical steam-powered pumps had been developed by Thomas Savery and Thomas Newcomen.23

In 1764, while repairing a model of the Newcomen engine, Watt identified a major flaw: the engine wasted significant amounts of steam because the cylinder was repeatedly heated and cooled. In 1765, Watt conceived the idea of a separate condenser, which allowed the cylinder to remain hot while condensation occurred in a separate chamber. This innovation made the engine far more efficient and practical for industrial use, eventually becoming a primary driver of the Industrial Revolution.124