Designation:E2071−00(Reapproved2015)StandardPracticeforCalculatingHeatofVaporizationorSublimationfromVaporPressureData1ThisstandardisissuedunderthefixeddesignationE2071;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticedescribesthecalculationoftheheatofvaporizationofaliquidortheheatofsublimationofasolidfrommeasuredvaporpressuredata.Itisapplicabletopureliquids,azeotropes,puresolids,andhomogenoussolidsolu-tionsoverthetemperaturerangeforwhichthevaporpressureequationfittedtothemeasureddataisapplicable.NOTE1—Thispracticeisgenerallynotapplicabletoliquidmixtures.Forapureliquidorazeotrope,compositiondoesnotchangeuponvaporizationsothattheintegralheatofvaporizationisidenticaltothedifferentialheatofvaporization.Non-azeotropicliquidmixtureschangecompositionuponvaporizing.Heatofvaporizationdatacomputedfromthispracticeforaliquidmixturearevalidonlyasanapproximationtothemixturedifferentialheatofvaporization;itisnotavalidapproximationtothemixtureintegralheatofvaporization.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3ThereisnoISOstandardequivalenttothispractice.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D2879TestMethodforVaporPressure-TemperatureRela-tionshipandInitialDecompositionTemperatureofLiq-uidsbyIsoteniscopeE1142TerminologyRelatingtoThermophysicalPropertiesE1194TestMethodforVaporPressure(Withdrawn2013)3E1719TestMethodforVaporPressureofLiquidsbyEbul-liometryE1782TestMethodforDeterminingVaporPressurebyThermalAnalysis3.Terminology3.1Symbols:3.1.1A,B,C—An...
