液体表面张力的测定（determination of surface tension of liquids）

《液体表面张力的测定（determination of surface tension of liquids）》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、液体表面张力的测定（Determinationofsurfacetensionofliquids）ExperimentfiveExperimentfiveexperimentfiveExperimentfiveDeterminationofsurfacetensionofliquidsDeterminationofsurfacetensionofliquids-DeterminationofsurfacetensionofliquidsDeterminationofsurfacetensionofliquidsTwo

2、billioneightmilliontwohundredandonethousandtwohundredandfive2008201205,20082012052008201205LiuseniorLiuZizhengLiuZizhengLiuzizheng1objective(1)todeterminethesurfacetensionofethanolsolutionwithdifferentconcentration,andcalculatethesurfaceadsorptioncapacityandthe

3、transverseofethanolmoleculeSectionalarea.(2)tounderstandthepropertiesofsurfacetensionandtherelationshipbetweensurfacetensionandadsorptioncapacity.(3)grasptheprincipleofmaximumbubblepressuremethodformeasuringsurfacetensionandsurfaceadsorptioncapacityofsolution.2

4、theprincipleofexperimentisthatinaliquidinterior,theattractionofanymoleculeisbalanced.ButonthesurfaceoftheliquidThemoleculesaredifferent.Becausethemoleculesonthesurfacelayerareattractedbythemoleculesintheliquidlayerontheonehand,theyareexposedtotheotherTheattract

5、ionofgasmoleculesoutsidetheliquid,andtheactionoftheformerisgreaterthanthatofthelatter.Therefore,onthesurfacelayerofliquidsurfaceEachmoleculeissubjectedtoanunbalancedforcethatisperpendiculartoanddirectedtowardtheinterioroftheliquid.Thisappealisapparentonthesurfa

6、ceThemoleculespushinwardtomakeupthesmallestareaoftheliquid.Toincreasethesurfaceareaofaliquid,itisnecessarytohaveresistanceTodowork,increasethepotentialenergyofmolecules.Therefore,moleculesarelargerinthesurfacelayerthanintheliquidPotentialenergy,whichissurfacefr

7、eeenergy,usuallyincreasesthemaximumworkrequiredbythesurfaceofasquaremeterbyAorincreasesGchangeofsurfacefreeenergybyasquaremeters,knownasthesurfaceunitsurfaceenergy,anditsunitisJ-m-1;Theforceactingonthesurfaceofaliquidandtheunitinitslengththatisusedtoshrinkitisc

8、alledsurfacetensionForce,whoseunitisN.M-1.Thesurfaceenergyofaunitsurfaceofaliquidisequaltoitssurfacetension.IfthesurfaceareaoftheliquidisincreasedbyS,thereversibleworkAshall