ASTMD559594=07595300553727T5T(#/bDesignation:D5595-94AMERICANSOCIETYFORTESTINGANDMATERIALS1916RaceSt.Philadelphia,Pa19103ReprintedIromtheAnnualBookofASTMStandards.CopyrightASTMlinotlistedinthecurrentcombinedindex.willappearintheneaiedtionStandardPracticeforDeterminingBuoyancyCorrectionsDuringPrecisionWeighingofLow-DensitySamples’ThisstandardisissuedunderthefixeddesignationD5595;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor.inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(c)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.IThispracticecoverstheproceduresusedtodeterminetruesamplemassfromscalereadings,bydeterminingtheeffectivevolumeofthesampleandapplyingacorrectionfortheeffectsofthebuoyancyoftheairinwhichsamplesareweighed.I.2Thispracticeprovidestheinformationrequiredtodeterminewhenbuoyancycorrectionsarewarranted,andwhentheycanbesafelyignored.1.3Thispracticeisusedwheneverasmalldifferenceinmassbetweentwolow-densitysamples(orthesamesampleonreweighing)mustbedeterminedwithahighlevelofaccuracy,toachievethedesiredtestmethodaccuracy.1.4RefertoPracticeE380inusingthispractice.NOTEI-Massdifferenceerrorsmaybeamajorsourceofinaccuracyinmethodsthatdonotproduceprecisionresultsevenaftercarefulweighing.Theuseofthisproceduremaybewarranted,therefore,intestmethodsthatpresentlydisplayaprecisionofonlyI20%,andmaysubsequentlydisplaybetterprecisionandrepeatability,aswellaslowerthresholds.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafityandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.IASTMStandards:E380PracticeforUseoftheInternationalSystemofUnits(SI)(theModemMetricSystem)2D1356TerminologyRelatingtoSamplingandAnalysisofAtmospheres3D363ITestMethodsforMeasuringSurfaceAtmosphericPressureD4230TestMethodforMeasurin...
