What a combustion engine is, its purpose and how it works.
Reviews what an external combustion engine is, its purpose, and how it works.
Discover how an external combustion engine called a Stirling engine works, some of the ways it is currently used, and how NASA plans to use the Stirling engine to produce electricity on spacecraft.
An article and animation that demonstrates how steam engines work.
Some history on the origin and creation of the steam engine.