Plunger (hydraulics) in the context of Hydraulic press

⭐ Core Definition: Plunger (hydraulics)

A plunger is a cylindrical rod used to transmit hydraulic compression force. It is characterized by its length being much greater than its diameter, and it is thus distinguished from a regular piston (where the working surface is larger than the thickness of the rod, i.e. more like a disk).

They are mainly used as part of certain types of pumps and hydraulic machines. Plungers are used for fluid-mechanical power transmission in pumps (plunger pumps), hydraulic gearboxes, high-pressure diesel injection pumps, hydraulic workshop presses and jacks, and other equipment, and are distinguished in fluid mechanics by being a piston without moving seals. The seals are instead located in the wall through which the plunger slides (as opposed to piston rings on a piston).

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Plunger (hydraulics) in the context of Syringe

A syringe is a simple reciprocating pump consisting of a plunger (though in modern syringes, it is actually a piston) that fits tightly within a cylindrical tube called a barrel. The plunger can be linearly pulled and pushed along the inside of the tube, allowing the syringe to take in and expel liquid or gas through a discharge orifice at the front (open) end of the tube. The open end of the syringe may be fitted with a hypodermic needle, a nozzle or tubing to direct the flow into and out of the barrel. Syringes are frequently used in clinical medicine to administer injections, infuse intravenous therapy into the bloodstream, apply compounds such as glue or lubricant, and draw/measure liquids. There are also prefilled syringes (disposable syringes marketed with liquid inside).

The word "syringe" is derived from the Greek σῦριγξ (syrinx, meaning "Pan flute", "tube").

View the full Wikipedia page for Syringe

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