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1、RLEPSurfacetensionbytheringmethod(DuNouymethod)1.4.05RelatedtopicsVolumetricpipette,20ml36579.001Surfaceenergy,interface,surfacetension,adhesion,criticalPipettor36592.001point,Eötvösequation.Pipettedish36589.001Graduatedcylinder100ml36629.001Filterpump,plastic02728.001Principlea
2、ndtaskEthylalcohol,absolute500ml30008.501TheforceismeasuredonaringshortlybeforealiquidfilmOliveoil,pure100ml30177.105tearsusingatorsionmeter.ThesurfacetensioniscalculatedWater,distilled5l31246.811fromthediameteroftheringandthetear-offforce.ProblemsEquipment1.Determinethesurfacet
3、ensionofoliveoilasafunctionofTorsiondynamometer,0.01N02416.001temperature.Surfacetensionmeasuringring17547.0012.Determinethesurfacetensionofwater/methanolmixturesRetortstand,h500mm37692.001asfunctionsofthemixtureratio.Magn.heatingstirrerw.temp.con35711.931Supportrod,l500mm/M10th
4、read02022.051Magn.stirringbar15mm,cyl.46299.011Set-upandprocedureUniversalclamp37715.002Performtheexperimentalset-upaccordingtoFig.1.TheRightangleclamp37697.002measuringringiscarefullydegreasedwithalcohol,rinsedInRightangleclamp-PASS-02040.551distilledwateranddried.Theringisatta
5、chedtotheleftarmofCrystallisingdish,boro3.3,1000ml46245.002thetorsiondynamometerusingasilkthread.Crystallisingdish,boro3.3,560ml46244.002Thetorsiondynamometer’sindicatorissetto“0”andtheLabthermometer,-10..+250C38065.001weightoftheringcompensatedusingtherearadjustingknobSilkthrea
6、d,200m02412.001sothattheleverarmisinthewhiteareabetweenthemarks.Glasstubes,straight,150mm,1036701.641TheliquidunderinvestigationispouredintoacarefullyStopcock,1-way,straight,glass36705.001cleaned900mlcrys-tallisingdishandtheringiscompletelyRubbertubing,i.d.7mm39282.002submerged.
7、IntheexperimenttheliquidiswarmedusingtheVolumetricpipette,10ml36578.001heatingunitofthemagneticstirrerandstirred.Assoonastherequiredtemperaturehasbeennearlyreached,switchofftheheatingandallowthetemperaturetostabilise(residualheatofheatingplate).Nowswitchoffthestirrerandallowthel
8、iquidtocometorest.Thenletliquidslowlyallowedtor
