Who invented the steam engine and in what year?

The steam engine significantly evolved over time, and while James Watt is often credited with its improvement and commercialization, the actual invention of the steam engine predates his contributions. Thomas Newcomen invented the first practical steam engine in 1712, primarily for pumping water out of mines. This engine was an early model and laid the groundwork for future advancements.

James Watt, who made his contributions in the 18th century, greatly improved upon the earlier designs by introducing a separate condenser in 1765, which significantly increased efficiency and usability. However, it is important to note that the year associated with his name is not indicative of the original invention.

Richard Trevithick advanced the steam engine further by creating high-pressure steam engines and later developing the first full-scale working railway steam locomotive, which occurred in the early 1800s. George Stephenson is known for his work in railways and locomotive development in the 1820s, notably with the locomotive "The Rocket."

Thus, while James Watt made remarkable contributions that transformed the steam engine into a more efficient and applicable power source, he did not invent it. The correct answer highlights Thomas Newcomen as the true inventor of the steam engine in 1712, a critical historical distinction