An area on a filter screen where no filtering occurs. Also known as dead area.

Related Terms


Measurement of the largest opening in the mesh of a filter screen; determined by the pressure needed to force air or gas through the screen while it is submerged in a liquid.


The clogging of filtering medium of a micro screen or a vacuum filter when the holes or spaces in the media become sealed off due to grease or the material being filtered. Also, insertion of blind flanges into a pipeline for isolation purposes.


The relationship of flow per unit area to differential pressure across a filter medium.


The bright area on the phosphorescent plan position indicator screen resulting from the brightening of the sweep by the echoes.


(1) The smallest area containing all possible survivor or search object locations. (2) For a scenario, the possibility area is the smallest area containing all possible survivor or search object locations that are consistent with the facts and assumptions used to form the scenario.


The general name for instruments used in air pollution studies for determining the amount of material deposited on a given area during a given time.


A flat coastal area flooded by most high tides, characterized by various species of marsh grasses and animal life.


  1. The major area of salt water covering the greater part of the earth. 2. One of the major divisions of the expanse of salt water covering the earth.


A sailing tactic for handling winds too strong for the sail area hoisted when reefing the sails is not feasible or possible. The headsail is set normally while the mainsail is let out till it is constantly luffing. This creates loss of force on the main and also reduces the efficiency of the headsail while still retaining sailing control of the vessel.


A series of screens, wires, or plates through which steam is passed to remove entrained moisture.

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