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1secondfromtheonsetofevaporation，thewavypaternofinterferogramsisobservedundertheliquidsurface， asanunsteadystateconditionhasbeenachievedduetodensitystratificationbroughtonbythetemperature profiles.Thisbuoyancy-driven-convectionwilgrowandafectthepaternandsizeo{thecels，whichhavebeen a1readycreatedbysurface-tensiondrivenconvectionintheliquidphase.Thismeansthatbuoyancy-driven- convectionmayalterCIGLandthecorrespondingconcentrationprofiles.
Extendingtheabovediscusiontoamicro-gravityenvironment，wherethereisnobuoyancyorgravity， onlysurface目 tension-drivenconvectionmayocur.AsaBenardcel cannotbeafectedbybuoyancy，thesizeof thecelswilincreasegradualyuntiltheyarerestrictedbythelateralwal.lWilthisphenornenacauseCIGLto increaseordecrease?Wehavelitleinformationaboutthis.However，thisisaveryirnportantmatterforfire s.afetyinmicro-gravity.Theflashpointofasubstanceistheternperatureatwhichthevaporpresureinair，at equilibriumconditions，equalsthelowerflarnmablelirnitforthatsubstance.Thereforeinopen.cupcondition， suchasfuelinopentraysorspiledonflorsetc.，flashpointisdeterminedbyCIGL.IfCIGLinμgishigherthan thatin19，flashpointinμgbecorneslowerthatin19andviceversa.Thissugeststhattheregulationsforhandling liquidfuelsinnormalgravityhavetobechangedforamicro-gravityenvironment.
Acknowledgements ThisresearchwassupportedinpartbytheGrant-in-Aid(No.A08750255)forScienceResearchfromthe
MinistryofEducation，ScienceandCultureofJapan. REFERENCES
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