Here's why:
* Alloy: Alloys are mixtures of metals (and sometimes other elements) designed to improve specific properties. While alloys are used in car parts, they don't define a type of car.
* Air Car: "Air car" is a term often used to describe vehicles that use compressed air as their primary source of power. These cars are still in development and not widely available.
It's possible you're thinking of one of the following:
* Air-powered car: A car that uses compressed air to drive a motor.
* Aluminum car: A car with significant use of aluminum, an alloy, in its construction.
Let me know if you had something else in mind and I'll do my best to explain!
