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A right circular cylinder with radius r and height h. A cylinder (from Greek ÎºÏÎ»Î¹Î½Î´ÏÎ¿Ï â kulindros, roller, tumbler) is one of the most basic curvilinear geometric shapes, the surface formed by the points at a fixed distance from a given straight line, the axis of the cylinder.
A piston is a sliding plug that fits closely inside the bore of a cylinder. Its purpose is either to change the volume enclosed by the cylinder, or to exert a force on a fluid inside the cylinder. The piston is an important component of piston engines and hydraulic systems. In an Otto or Diesel engine, the concave head of the piston forms one wall of an expansion chamber inside the cylinder. The opposite wall, called the cylinder head, contains inlet and exhaust valves for gases.