FLUID, HYDRAULIC—A fluid suitable foruse in a hydraulic system.FLUID, PETROLEUM—A fluid composedof petroleum oil. It may contain additives.FLUID, PHOSPHATE ESTER BASE—Afluid that contains a phosphate ester as one of themajor components.FLUID, SILICONE—A fluid composed ofsilicones. It may contain additives.FLUID, WATER-GLYCOL—A fluid whosemajor constituents are water and one or moreglycols or polyglycols.FLUID STABILITY—Resistance of a fluid topermanent change in properties.FLUID POWER—Energy transmitted andcontrolled through the use of fluids underpressure.FLUID POWER SYSTEM—A system thattransmits and controls power through use of apressurized fluid within an enclosed circuit.FOOT-POUND—The amount of workaccomplished when a force of 1 pound producesa displacement of 1 foot.FORCE—The action of one body on anothertending to change the state of motion of the bodyacted upon.FREE FLOW—Flow that encounters negli-gible resistance.FRICTION—The action of one body orsubstance rubbing against another, such as fluidflowing against the walls of pipe; the resistanceto motion caused by this rubbing.FRICTION PRESSURE DROP—The decreasein the pressure of a fluid flowing through apassage attributable to the friction between thefluid and the passage walls.GAS—The form of matter that has neither adefinite shape nor a definite volume.GASKET—A class of seals that provides a sealbetween two stationary parts.GAUGE—An instrument or device forcharacteristic.measuring, indicating, or comparing a physicalGAUGE PRESSURE—Pressure aboveatmospheric pressure.GAUGE SNUBBER—A device installed inthe line to the pressure gauge used to dampenpressure surges and thus provide a steady readingand a protection for the gauge.GAUGE, BELLOWS—A gauge in which thesensing element is a convoluted closed cylinder.A pressure differential between the outside andthe inside causes the cylinder to expand or contractaxially.GAUGE, BOURDON TUBE—A pressuregauge in which the sensing element is a curvedtube that tends to straighten out when subjectedto internal fluid pressure.GAUGE, DIAPHRAGM—A gauge in whichthe sensing element is relatively thin and its innerportion is free to deflect with respect to itsperiphery.GAUGE, PRESSURE—A gauge thatindicates the pressure in the system to which itis connected.GAUGE, VACUUM—A pressure gauge forpressures less than atmospheric.GRAVITY—The force that tends to draw allbodies toward the center of the earth. The weightof a body is the resultant of gravitational forceacting on the body.HEAD—The height of a column or body offluid above a given point expressed in linear units.Head is often used to indicate gauge pressure.Pressure is equal to the height times the densityof the fluid.HEAD, FRICTION—The head required toovercome the friction at the interior surface ofa conductor and between fluid particles in motion.It varies with flow, size, type, and condition ofconductors and fittings, and fluid characteristics,HEAD, STATIC—The height of a column orbody of fluid above a given point.AI-4
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