See soorce fer Piston

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[[File:Piston_of_DAT_engine.jpg|thumb|Pistons within a sectioned [[petrol ingine]]]]

A '''piston''' is a component o reciprocating [[ingine]]s, reciprocating pumps, gas compressors an pneumatic cylinders, amang ither seemilar mechanisms. It is the muivin component that is contained bi a cylinder an is made gas-tight bi piston rings. In an ingine, its purpose is tae transfer force frae expanding gas in the cylinder tae the crankshaft via a piston rod an/or connecting rod. In a pump, the function is reversed an force is transferred frae the crankshaft tae the piston for the purpose o compressing or ejecting the [[Fluid (pheesics)|fluid]] in the cylinder. In some ingines, the piston an aw acts as a valve bi covering an uncovering ports in the cylinder wall.

[[Category:Ingine technology]]