Designation:D1914−95(Reapproved2014)StandardPracticeforConversionUnitsandFactorsRelatingtoSamplingandAnalysisofAtmospheres1ThisstandardisissuedunderthefixeddesignationD1914;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeprovidesunitsandfactorsusefulformembersoftheairpollutionandmeteorologicalcommunities.1.2ThispracticeisusedtogetherwithIEEE/ASTMSI-10,whichdiscussesSIunitsandcontainsselectedconversionfactorsforinter-relationofSIunitsandsomecommonlyusednon-metricunits.2.ReferencedDocuments2.1ASTMStandards:2D1356TerminologyRelatingtoSamplingandAnalysisofAtmospheresE11SpecificationforWovenWireTestSieveClothandTestSievesIEEE/ASTMSI-10StandardforUseoftheInternationalSystemofUnits(SI):TheModernMetricSystem3.SignificanceandUse3.1ASTMrequirestheuseofSIunitsinallitspublicationsandtheiruseinreportingatmosphericmeasurementdata.However,therearehistoricdataandevendatacurrentlyreportedthatarebasedonavarietyofunitsofmeasurement.ThispracticetabulatesfactorsthatarenecessarytoconvertsuchdatatoSIandotherunitsofmeasurement.3.2IEEE/ASTMSI-10doesnotlistalltheconversionfactorscommonlyusedinairpollutionandmeteorologicalfields.ThispracticesupplementsIEEE/ASTMSI-10.3.3Thevaluesreportedherewereobtainedfromanumberofstandardpublications.Theywereadjustedtofivefiguresandorganizedinarationalorder.Allvaluesreflectthelatestinformationfromthe16thGeneralConferenceonWeightsandMeasurementsheldin1979.3.4ThefactorsinTable1areprovidedtochangeunitsofmeasurementfromonesystemtorelatedunitsinothersystems,aswellastosmallerorlargerunitsinthesamesystem.3.5Valuesofunitsintheleftcolumnmaybeconvertedtovaluesofunitsintherightcolumnmerelybymultiplyingbytheconversionfactorprovidedinthecentercolumn.1ThispracticeisunderthejurisdictionofASTMCommitteeD22onAirQualityandisthedirectresponsibilit...
