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What is "piston displacement"

The Collaborative International Dictionary
Piston displacement

Displacement \Dis*place"ment\, n. [Cf. F. d['e]placement.]

  1. The act of displacing, or the state of being displaced; a putting out of place.

    Unnecessary displacement of funds.
    --A. Hamilton.

    The displacement of the sun by parallax.
    --Whewell.

  2. The quantity of anything, as water, displaced by a floating body, as by a ship, the weight of the displaced liquid being equal to that of the displacing body.

  3. (Chem.) The process of extracting soluble substances from organic material and the like, whereby a quantity of saturated solvent is displaced, or removed, for another quantity of the solvent.

    Piston displacement (Mech.), the volume of the space swept through, or weight of steam, water, etc., displaced, in a given time, by the piston of a steam engine or pump.