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YYoung’srule717●YYYeager,ErnestBill(Sep.,,Orange,NJ,USA–Mar.,,Cleve-land,OH,USA)Americanelectrochemist;BAMont-clairStateUniversity;MSWesternReserveUniver-sity,Cleveland;PhDinphysicalchemistryWesternReserveUniversity,Cleveland.AtWesternReserveUniversity,associateprofessor(–)thenprofes-sor(–)and,since,FrankHovorkaProfes-sor;founderofCaseCenterofElectrochemicalSciences;retired;morethanpublications;editororco-editorofbooks;researchon�electrodekinetics,�spectroelectrochemistry,�electrocatalysis,ultrasound.Ref.:()TheElectrochemicalSociety,Interface():RHYoung’sequation—Adropletofaliquidlayingonaplanesolidandsurroundedbythevaporphase(cf.Fig.),willexhibita�contactangleΘthatfollowsfromtheequationγS–V=γS–L−γL–VcosΘ,whereγdenotesthe�interfacialtensionbetweenthedifferentphases(S–V:solid–vapor,S–L:solid–liquid,L–V:liquid–vapor)(�Young’srule).Thisequationisbasedontheassumptionof�equilibriumbetweenallthreephases.Th.Young(June,,Mil