Designation:D7945−21aStandardTestMethodforDeterminationofDynamicViscosityandDerivedKinematicViscosityofLiquidsbyConstantPressureViscometer1ThisstandardisissuedunderthefixeddesignationD7945;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthemeasurementofdynamicviscosityanddensityforthepurposeofderivationofkinematicviscosityofpetroleumliquids,bothtransparentandopaque.Thekinematicviscosity,ν,inthistestmethodisderivedbydividingthedynamicviscosity,η,bythedensity,ρ,obtainedatthesametesttemperature.ThistestmethodalsocalculatesthetemperatureatwhichpetroleumliquidsattainaspecifiedkinematicviscosityusingPracticeD341.1.2Theresultobtainedfromthistestmethodisdependentuponthebehaviorofthesampleandisintendedforapplicationtoliquidsforwhichprimarilytheshearstressandshearrateareproportional(Newtonianflowbehavior).1.3Therangeofkinematicviscositycoveredbythistestmethodisfrom0.5mm2/sto1000mm2/sinthetemperaturerangebetween–40°Cto120°C;howevertheprecisionhasbeendeterminedonlyforfuelsandoilsintherangeof2.06mm2/sto476mm2/sat40°Cand1.09mm2/sto107mm2/sat100°C(asstatedinSection12onPrecisionandBias).Forjetfuels,theprecisionofkinematicviscosityhasbeendeterminedintherangeof2.957mm2/sto5.805mm2/sat–20°Cand5.505mm2/sto13.03mm2/sat–40°C(asstatedinSection12onPrecisionandBias),andtheprecisionofthetemperatureat12mm2/s(cSt)hasbeendeterminedintherangeof–38.3°Cto–58.1°C(asstatedinSection13onPrecisionandBias).Theprecisionhasonlybeendeterminedforthosematerials,viscosityranges,andtemperaturesasindicatedinSection12onPrecisionandBias.Thetestmethodcanbeappliedtoawiderrangeofmaterials,viscosity,andtemperature.FormaterialsnotlistedinSection12onPrecisionandBias,theprecisionandbiasmaynotbeapplicable.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootheru...
