Back pressure
Pressure Pres"sure (?; 138), n. [OF., fr. L. pressura, fr. premere. See 4th {Press}.] 1. The act of pressing, or the condition of being pressed; compression; a squeezing; a crushing; as, a pressure of the hand. [1913 Webster]

2. A contrasting force or impulse of any kind; as, the pressure of poverty; the pressure of taxes; the pressure of motives on the mind; the pressure of civilization. [1913 Webster]

Where the pressure of danger was not felt. --Macaulay. [1913 Webster]

3. Affliction; distress; grievance. [1913 Webster]

My people's pressures are grievous. --Eikon Basilike. [1913 Webster]

In the midst of his great troubles and pressures. --Atterbury. [1913 Webster]

4. Urgency; as, the pressure of business. [1913 Webster]

5. Impression; stamp; character impressed. [1913 Webster]

All saws of books, all forms, all pressures past. --Shak. [1913 Webster]

6. (Mech.) The action of a force against some obstacle or opposing force; a force in the nature of a thrust, distributed over a surface, often estimated with reference to the amount upon a unit's area. [1913 Webster]

7. Electro-motive force. [Webster 1913 Suppl.]

{Atmospheric pressure}, {Center of pressure}, etc. See under {Atmospheric}, {Center}, etc.

{Back pressure} (Steam engine), pressure which resists the motion of the piston, as the pressure of exhaust steam which does not find free outlet.

{Fluid pressure}, pressure like that exerted by a fluid. It is a thrust which is normal and equally intense in all directions around a point. --Rankine.

{Pressure gauge}, a gauge for indicating fluid pressure; a manometer. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Back pressure — usually refers to the pressure exerted on a moving fluid by obstructions or tight bends in the confinement vessel along which it is moving, such as piping or air vents, against its direction of flow. For example, an automotive exhaust muffler… …   Wikipedia

  • Back pressure — Back Back, a. 1. Being at the back or in the rear; distant; remote; as, the back door; back settlements. [1913 Webster] 2. Being in arrear; overdue; as, back rent. [1913 Webster] 3. Moving or operating backward; as, back action. [1913 Webster]… …   The Collaborative International Dictionary of English

  • back pressure — [1] The resistance to the flow of exhaust gases through the exhaust system. By rerouting the exhaust gases for noise suppression, a muffler causes back pressure, but a straight pipe alone causes only minimal back pressure. Some engines require… …   Dictionary of automotive terms

  • back pressure — noun 1. : residual pressure on the exhaust side of a steam engine piston against which the steam on the intake side must work 2. : opposition to flow of a liquid or gas due to friction, inertia, gravity, or other cause * * * back pressure noun… …   Useful english dictionary

  • back pressure — atgalinis slėgis statusas T sritis fizika atitikmenys: angl. back pressure; backpressure; return pressure vok. Gegendruck, m; Rückdruck, m rus. обратное давление, n pranc. contre pression, f; pression de retour, f …   Fizikos terminų žodynas

  • back pressure — pressure in direct opposition to the normal flow …   English contemporary dictionary

  • back pressure — A pressure exerted backward; in a field of fluid flow, a pressure exerted contrary to the pressure producing the main flow. Specifically, the pressure inside the exhaust system of a reciprocating engine that prevents the flow of burned gases from …   Aviation dictionary

  • back pressure — the pressure caused by the damming back of the blood in a heart chamber and its tributaries, due to an obstructive heart valve or failing myocardium …   Medical dictionary

  • Back pressure — Противодавление; Давление между печатным и офсетным цилиндрами …   Краткий толковый словарь по полиграфии

  • back pressure — ● ►en loc. ►PERIPH Fonction intelligente de contrôle de flux (flow control en anglais), dans le mode half duplex pour un répartiteur (switch). Il bloque l émission en cas de congestion (définition de Jean Pierre Kolly) …   Dictionnaire d'informatique francophone

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