Vacuum ejector
The fluid leaving the jet is flowing at a high velocity which due to Bernoulli's principle results in it having low pressure, thus generating a vacuum.The cheap and simple water aspirator is commonly used in chemistry and biology laboratories and consists of a tee fitting attached to a tap and has a hose barb at one side.However, they are water-intensive, and depending on what the vacuum is being used for (e.g. solvent removal), they can violate environmental protection laws such as the RCRA by mixing potentially hazardous chemicals into the water stream, then flushing them down a drain that often leads directly to the municipal sewer.Typically referred to as an eductor in these applications, this is preferred over electrical pumps due to their simplicity, compact size, and greatly mitigated risk of explosion in the event that flammable liquids and/or vapors are present.In order to avoid using too much steam or impractical operating pressures, a single steam-ejector stage is generally not used to generate vacuum below approximately 10 kPa (75 mmHg).An additional use for the injector technology is in vacuum ejectors in continuous train braking systems, which were made compulsory in the UK by the Regulation of Railways Act 1889.
Aspirator (disambiguation)injectorvacuum pumpvacuumVenturi effectBernoulli's principlevapor pressurechemistrybiologylaboratorieshose barbgraphitesteam ejectorsteam injectorcontinuous train braking systemsRegulation of Railways Act 1889smokeboxcrossheadairbrushesDeaeratorDiffusion pumpAlcohol burnerBunsen burnerDesiccatorHeating mantleHot plateLab ovenMeker–Fisher burnerTeclu burnerWater bathVacuum dry boxChemostatHomogenizerLiquid whistleMagnetic stirrerMortar and pestleShakerSonicatorStatic mixerStirring rodVortex mixerWash bottleClampsClamp holderTripodBurette clampIron ringRetort standTest tube holderTest tube rackWire gauzeLab drying rackAgar plateCryogenic storage dewarIncubatorLaminar flow cabinetMicrotiter platePetri dishPicotiter plateRefrigeratorAspiratorAutoclaveCork borerCrucibleFilter paperForcepsCentrifugeMicroscopePipeclay triangleSpectrophotometerSplintStopperScoopulaSpatulaTest tube brushWire brushInoculation needleInoculation loopGlasswareDean–StarkSoxhlet extractorKipp'sBoston roundCondensersCold fingerLiebigEvaporatingSyracuseWatch glassFlasksBüchnerVacuum (Dewar)ErlenmeyerFernbachFleakerFlorenceRetortRound-bottomSchlenkVolumetricHirschDroppingSeparatoryBuretteConical measureCuvetteEye dropperEudiometerGraduated cylinderOstwald viscometerPipetteDryingCragieNuclear magnetic resonance (NMR)ThieleThistleBeakerBell jarGas syringeAnalytical chemistryAutoAnalyzerCHN analyzerColorimeterInductively coupled plasma (ICP) deviceGas chromatograph (GC)Liquid chromatograph (LC)