Here's why:
* Internal Combustion Engines: The fuel is burned *inside* the engine, directly powering the pistons. This creates the force that drives the engine.
* External Combustion Engines: The fuel is burned *outside* the engine, and the resulting heat is used to power the engine. A common example is a steam engine.
Gasoline and diesel engines both have:
* Fuel combustion happening within the engine cylinders.
* The expansion of hot gases pushing pistons, which in turn rotates a crankshaft to produce power.
Let me know if you have any other questions!
