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Cover Story
CinematicimaginationembeddedintheTENET
Inversion,whichoverturnsthelawsofphysics,isestablishedbynegatingthesecondlawofthermodynamics.But
how can this thermodynamic concept move to the dimension of time and make an impact? Or rather, what is the
relationshipbetweendisorderandtimeinthefirstplace?
Entropyandorientationoftime
To this question, Son Seung-Woo, professor of the Department of Applied Physics at Hanyang University,
explained the direction of time. By feeling the increase in entropy, one feels that time is passing. Suppose one is
rapidlyfreezingthewaterandspreadinginkinsidewhollyatonce.Surelytheinkwillstopandwillnotspread.In
otherwords,theamountofchangeinentropyiszero,andthepersonwatchingdoesnotknowwhetherthisscreenis
frozenorwhethertimeispassingwhilewaterisfrozen.Now,let’sinvert(rewind)theprocessofreleasingtheinkin
unfrozenwater.Thereleasedinkwillgraduallygatherandcometogetheratonepoint.Entropyisdecreasing!That
is,itcanbeseenthattheincreaseinentropyandthedirectionofthepassageoftimearethesame.Nolanlaidthe
theoreticalfoundationforthefilmbytyinguptheeventofincreasingentropyandtheeventofthetimeflowinginto
onecausalrelationship.
homepage
official
ⓒTENET
▲Thescenehighlightsoneofthekey
▲ProtagonistandNeiltalkabouttheinversion ▲Whenpersoninverted,onemustweara
momentsleadinguptothemovie’sclimax
oxygenmask
Entropyandorientationofphysicallaw
ChristopherNolanmadeafilmbylinkingtheentropyofthermodynamicconceptswithtime.However,thesecond
lawofthermodynamicsitselfisincontactwiththemovementofheatandthedirectionofairmolecules,andNolan
unfoldedhisimaginationofwhatwouldhappenifthesecondlawwasdeniedthroughtheintroductionofatechnique
calledinversion.First,accordingtothesecondlawofthermodynamics,becausetheentropyincreases,thedirection
oftemperatureoccurs.Itisthedirectioninwhichheatmovesfromhigh-energy,high-temperatureairtolow-energy,
low-temperature air. But, if the second law of thermodynamics is reversed through inversion, the direction of heat
will be reversed. This inverted direction reveals why the inverted protagonist suffered from hypothermia when
he experienced an explosion. If he was not inverted, the high-temperature heat from the explosion would have hit
the protagonist. So, high-temperature heat would have spread to the protagonist and the protagonist would have
becomeawell-donehumansteak.Theoxygenmaskcanalsobeunderstoodinthesamecontext.Underthesecond
lawofthermodynamics,thetransmissionofoxygenbydiffusionmusttakeplacefromthebloodtothebody,butthe
inversionreversesitandthebreathingbecomesadestructiveprocessbytheinvertedoxygen.
19
NOVEMBER 2020
CinematicimaginationembeddedintheTENET
Inversion,whichoverturnsthelawsofphysics,isestablishedbynegatingthesecondlawofthermodynamics.But
how can this thermodynamic concept move to the dimension of time and make an impact? Or rather, what is the
relationshipbetweendisorderandtimeinthefirstplace?
Entropyandorientationoftime
To this question, Son Seung-Woo, professor of the Department of Applied Physics at Hanyang University,
explained the direction of time. By feeling the increase in entropy, one feels that time is passing. Suppose one is
rapidlyfreezingthewaterandspreadinginkinsidewhollyatonce.Surelytheinkwillstopandwillnotspread.In
otherwords,theamountofchangeinentropyiszero,andthepersonwatchingdoesnotknowwhetherthisscreenis
frozenorwhethertimeispassingwhilewaterisfrozen.Now,let’sinvert(rewind)theprocessofreleasingtheinkin
unfrozenwater.Thereleasedinkwillgraduallygatherandcometogetheratonepoint.Entropyisdecreasing!That
is,itcanbeseenthattheincreaseinentropyandthedirectionofthepassageoftimearethesame.Nolanlaidthe
theoreticalfoundationforthefilmbytyinguptheeventofincreasingentropyandtheeventofthetimeflowinginto
onecausalrelationship.
homepage
official
ⓒTENET
▲Thescenehighlightsoneofthekey
▲ProtagonistandNeiltalkabouttheinversion ▲Whenpersoninverted,onemustweara
momentsleadinguptothemovie’sclimax
oxygenmask
Entropyandorientationofphysicallaw
ChristopherNolanmadeafilmbylinkingtheentropyofthermodynamicconceptswithtime.However,thesecond
lawofthermodynamicsitselfisincontactwiththemovementofheatandthedirectionofairmolecules,andNolan
unfoldedhisimaginationofwhatwouldhappenifthesecondlawwasdeniedthroughtheintroductionofatechnique
calledinversion.First,accordingtothesecondlawofthermodynamics,becausetheentropyincreases,thedirection
oftemperatureoccurs.Itisthedirectioninwhichheatmovesfromhigh-energy,high-temperatureairtolow-energy,
low-temperature air. But, if the second law of thermodynamics is reversed through inversion, the direction of heat
will be reversed. This inverted direction reveals why the inverted protagonist suffered from hypothermia when
he experienced an explosion. If he was not inverted, the high-temperature heat from the explosion would have hit
the protagonist. So, high-temperature heat would have spread to the protagonist and the protagonist would have
becomeawell-donehumansteak.Theoxygenmaskcanalsobeunderstoodinthesamecontext.Underthesecond
lawofthermodynamics,thetransmissionofoxygenbydiffusionmusttakeplacefromthebloodtothebody,butthe
inversionreversesitandthebreathingbecomesadestructiveprocessbytheinvertedoxygen.
19
NOVEMBER 2020
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