Why is engine oil in cars also called motor even though engines convert chemical energy while motors electrical energy?

You're right to point out the difference between engines and motors! It's true that engines convert chemical energy (from fuel) into mechanical energy, while motors convert electrical energy into mechanical energy.

However, the term "motor oil" is a historical holdover from the early days of automobiles.

Here's the breakdown:

* Early Automobiles: Many early automobiles used electric motors for propulsion. Therefore, the lubricant used in those motors was called "motor oil."

* Internal Combustion Engines: As internal combustion engines became the dominant power source, the term "motor oil" stuck. It became a generic term for the lubricant used in all types of engines, including internal combustion engines.

* Evolution of Terminology: While the term "motor oil" is still widely used, the term "engine oil" is more technically accurate, reflecting the fact that it's used in engines of all types.

So, the term "motor oil" is a bit of a historical anomaly that continues to be used out of habit. However, it's important to remember that "motor oil" and "engine oil" refer to the same lubricant.