A car is made of different materials. The windscreen, for example, is made of glass. The headlights are also made of glass. The tires are made of rubber. They are filled with air. The air in the tires is compressed (to approximately 1,5gm/cm3). The body is made of metal. The metal is painted. The steering wheel is made of plastic. The mirrors are made of plastic and glass. The rear-view mirror is fixed to the roof. The wing-mirror is fixed to the door.
The engine is made of different metals. The pistons are made of aluminum and the valves are made of steel. The springs are also made of steel.