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1、自由潛水自由潛水PhysicsPhysicsPhysiologyPhysiology11313PhysicsPhysiologyofExtremeEnvironments–RDVannYoulearnedmuchofthephysicsyouneedfthiscourseinhighschoolbutprobablydidn’tuseitinmedicalschool.Unlessyoucandothephysicssomeofthee
2、nvironmentaleffectswillbemysterious.I’llreviewtheprinciplesphysiologicalapplicationsyou’lldosomepracticeproblemsinfrontoftheclass.(There’snothinglikepublichumiliationtostimulatelearning.)TheanswersareinthePowerpointslide
3、ssoyoucanstudythemlater.Thereisnohomewkbutthereareseveralproblemsonthefirstexamyouwilloccasionallyneedphysicsfotherproblems.WhatIsthePhysicalEnvironmentAspectsofthephysicalenvironmentwewillconsiderincludepressuretemperat
4、urebreathinggascompositionimmersiongravitationaccelerationradiation.KiicTheyofMatterPhysicsdealswiththepropertiesbehaviofmatter.Matterisanythingthatoccupiesspacehasweight.Allmatterismadeupofmoleculeswhichareinconstantrom
5、thermalmotion(kiicenergy).ThismotionissensedasmeasurementpositionofAirAirisprimarilynitrogen(78%)with1%argonbutgenerallyconsideredtobe79%nitrogen.AtmosphericPressureLikeacolumnofwatertheatmospherehasweighttoo.Thetotalwei
6、ghtoftheatmospherefromspacetosealevelexertsafceof14.7poundsoneachsquareinchoftheearth’ssurface.Thisistheiginoftheunit1atmosphere14.7poundspersquareinch(psi).Unlikewaterairiscompressedbytheweightoftheatmosphereaboveitsden
7、sitypressurearenotproptionaltotheheight.Fexamplethemaximumcabinaltitudeinacommercialaircraftmustnotexceed8000’accdingtoFAAregulations.Thepressureat8000’is0.74atm.ThealtitudeonMt.Everestat29108’wherethepressureis0.31atm.T
8、hepressureinaNASAspacesuitis0.29atm(4.3psi)whichisequivalenttoanaltitudeofabout30000.AltitudePressureatSpecificSitesThehighestinhabitedcityisLaPazBoliviaat12730ft.TheU.S.ArmymaintainsanaltituderesearchlabatyonPikesPeakCO
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