We just learned about the Engine Block of a car.
One part of the engine block is the Cylinder.
The engine has a piston that goes up and down to make the car move, and the cylinder is the place that holds the piston.
Sometimes a car will 4, 6 or 8 cylinders depending on how many pistons there are.
(from: wikipedia - cylinder (engine))
Kid Facts - Blast from the past: Poppet Valve
