Physical Transformation AtlasPTA
Coverage · dataset rbfbfcbb70e57

What the atlas covers

These counts describe this atlas, not the completeness of physics or the literature. Scope fill uses the atlas's editorial checklist; citation completeness only asks whether each claim record cites a source.

These measures describe this atlas, not the completeness of physics or the scientific literature. Scope fill compares phenomenon records in this revision with an editorial first-release checklist per domain. Citation completeness reports the fraction of claim records carrying at least one cited source; it does not mean the literature has been comprehensively searched. Every number below is a count over the records of revision rbfbfcbb70e57.

Thermodynamics
scope fill 38%
recorded / target10 / 26
claims sourced49 / 49
established+replicated / demonstrated / open38 / 11 / 0
no-search / matrix100 / 100
reviewed / index-only0 / 0
newest cited2026
named pathways18
Classical mechanics
scope fill 10%
recorded / target3 / 30
claims sourced18 / 18
established+replicated / demonstrated / open15 / 3 / 0
no-search / matrixno coupling column
reviewed / index-only0 / 0
newest cited2025
named pathways12
Electromagnetism
scope fill 15%
recorded / target6 / 40
claims sourced30 / 30
established+replicated / demonstrated / open22 / 8 / 0
no-search / matrix75 / 75
reviewed / index-only0 / 0
newest cited2022
named pathways22
Electrochemistry
scope fill 40%
recorded / target12 / 30
claims sourced67 / 67
established+replicated / demonstrated / open48 / 19 / 2
no-search / matrix100 / 100
reviewed / index-only0 / 0
newest cited2024
named pathways11
Condensed matter
scope fill 38%
recorded / target23 / 61
claims sourced122 / 122
established+replicated / demonstrated / open92 / 28 / 6
no-search / matrix271 / 275
reviewed / index-only1 / 4
newest cited2026
named pathways25
Fluid mechanics
scope fill 31%
recorded / target8 / 26
claims sourced44 / 44
established+replicated / demonstrated / open30 / 13 / 1
no-search / matrix75 / 75
reviewed / index-only0 / 0
newest cited2026
named pathways19
Optics and photonics
scope fill 37%
recorded / target11 / 30
claims sourced55 / 55
established+replicated / demonstrated / open46 / 7 / 2
no-search / matrix125 / 125
reviewed / index-only0 / 0
newest cited2025
named pathways11
Spin systems
scope fill 23%
recorded / target7 / 30
claims sourced28 / 28
established+replicated / demonstrated / open27 / 1 / 0
no-search / matrix25 / 25
reviewed / index-only0 / 0
newest cited2019
named pathways3
Nuclear physics
scope fill 35%
recorded / target7 / 20
claims sourced34 / 34
established+replicated / demonstrated / open30 / 4 / 0
no-search / matrix75 / 75
reviewed / index-only0 / 0
newest cited2025
named pathways7
Plasma physics
scope fill 5%
recorded / target1 / 20
claims sourced6 / 6
established+replicated / demonstrated / open4 / 2 / 0
no-search / matrix25 / 25
reviewed / index-only0 / 0
newest cited2016
named pathways1
Quantum transport
scope fill 6%
recorded / target2 / 35
claims sourced6 / 6
established+replicated / demonstrated / open5 / 1 / 0
no-search / matrix25 / 25
reviewed / index-only0 / 0
newest cited2015
named pathways0
Biophysical transduction
scope fill 7%
recorded / target2 / 30
claims sourced9 / 9
established+replicated / demonstrated / open9 / 0 / 0
no-search / matrix25 / 25
reviewed / index-only0 / 0
newest cited2014
named pathways2
Surfaces and interfaces
scope fill 17%
recorded / target5 / 30
claims sourced31 / 31
established+replicated / demonstrated / open13 / 18 / 0
no-search / matrix49 / 50
reviewed / index-only1 / 0
newest cited2026
named pathways10
Chemistry
scope fill 12%
recorded / target3 / 25
claims sourced14 / 14
established+replicated / demonstrated / open10 / 4 / 0
no-search / matrix25 / 25
reviewed / index-only0 / 0
newest cited2022
named pathways7
DomainEditorial scope fillrecorded / scope targetclaims with source / claimsestablished+replicated / demonstrated / openno-search cells / matrix cellsreviewed / index-only searchesnewest cited sourcenamed pathways
Thermodynamics 38%10 / 2649 / 4938 / 11 / 0100 / 1000 / 0202618
Classical mechanics 10%3 / 3018 / 1815 / 3 / 0no coupling column0 / 0202512
Electromagnetism 15%6 / 4030 / 3022 / 8 / 075 / 750 / 0202222
Electrochemistry 40%12 / 3067 / 6748 / 19 / 2100 / 1000 / 0202411
Condensed matter 38%23 / 61122 / 12292 / 28 / 6271 / 2751 / 4202625
Fluid mechanics 31%8 / 2644 / 4430 / 13 / 175 / 750 / 0202619
Optics and photonics 37%11 / 3055 / 5546 / 7 / 2125 / 1250 / 0202511
Spin systems 23%7 / 3028 / 2827 / 1 / 025 / 250 / 020193
Nuclear physics 35%7 / 2034 / 3430 / 4 / 075 / 750 / 020257
Plasma physics 5%1 / 206 / 64 / 2 / 025 / 250 / 020161
Quantum transport 6%2 / 356 / 65 / 1 / 025 / 250 / 020150
Biophysical transduction 7%2 / 309 / 99 / 0 / 025 / 250 / 020142
Surfaces and interfaces 17%5 / 3031 / 3113 / 18 / 049 / 501 / 0202610
Chemistry 12%3 / 2514 / 1410 / 4 / 025 / 250 / 020227

Aggregate scope fill: 100 / 433 editorial checklist slots in this revision (23.1%); the denominator is maintained by the atlas and is not an estimate of the number of physical phenomena in nature. A pathway with steps in two domains counts in both. "No-search cells" are matrix cells in the domain's coupling columns with no search record of any kind; "newest cited source" is citation recency, not search recency.

Corpus

entities
353 entity records
phenomena
100 phenomenon records
claims
523 canonical claim records · 0 without a source · 11 reported / theoretical / hypothesised / disputed claim records
sources
235 source records · 204 with a DOI · 137 DOIs matched against Crossref
named pathways
93 recorded named pathways
systems
2 recorded multi-route systems (pass 34: linear pathways joined by documented handoffs)
routes
771 routes enumerated from the current claim graph · 86 with a recorded complete-composition demonstration · 0 with a reviewed search that found none · 674 with no search record
matrix
1000 cells · 68 with a recorded direct relation · 932 with no recorded direct relation · 995 with no search record
dataset generated
2026-09-21
search records through
2026-09-21
reviewed search records
13
index-only search runs
16

Scope checklist · 333 phenomena the atlas intends to record and has not yet

The per-domain checklists live in data/canonical/ontology/domains.yaml; each domain's target is the length of its list. Recorded phenomena link to their pages.

Thermodynamics · 10 recorded · 16 missing

Dufour effectThermo-osmosisThermoacoustic effectSoret effectThermal expansionHeat conductionDiffusionWorking-fluid expansion (heat-engine cycle)Ocean thermal energy conversionGas-dynamic expansionjoule thomson expansionlatent heat phase changeadiabatic compression heatingnatural convectionthermal radiation exchangeregenerative heat exchangeabsorption refrigerationadsorption heat transformationthermal transpirationthermophoresisstirling cycle regenerationrankine cycle evaporationkalina mixture boilingthermochemical heat storagethermal rectificationheat pipe transport

Classical mechanics · 3 recorded · 27 missing

Elastic deformationResonant vibrationGravitational descent of fluidflywheel inertial storagependulum oscillationgear torque conversionlever mechanical advantagespring energy storagefriction dissipationimpact momentum transfercentrifugal separationgyroscopic precessionbuckling snap throughparametric resonancenonlinear vibration broadeningfrequency up conversionmechanical rectificationratchet motionvibration isolationacoustic radiation forcehydraulic transmissionpneumatic compressionrolling resistancetorsional oscillationcam follower conversionclockwork escapementgravitational tidal forcingmechanical metamaterial transductionshock wave compressionbistable mechanism switching

Electromagnetism · 6 recorded · 34 missing

Electrostatic induction (variable capacitance)Electromagnetic inductionRectificationAntenna receptionRotating-machine generator actionLinear alternator actionjoule heatinginduction heatingeddy current dampingdielectric heatinglorentz force actuationelectrostatic actuationcapacitive energy storageinductive energy storagetransformer actionelectret charge storagecorona dischargeelectrostatic precipitationmagnetic levitationmagnetic hysteresis losselectromagnetic wave radiationmicrowave absorption heatingwireless power transferelectromagnetic brakingmotor actionhomopolar generationunipolar inductionskin effect lossdielectric breakdowntriboelectric charge separationelectrostatic dischargeplasma arc heatingelectrodynamic tethermagnetic reconnectionsuperconducting current storageflux pumpingelectromagnetic stirringmagnetic gearinginductive chargingpiezoresistive sensing

Electrochemistry · 12 recorded · 18 missing

Ionic thermoelectric effectThermogalvanic effectPhotoelectrochemical effectGalvanic (redox) reactionFuel-cell electro-oxidationConcentration cell effectReverse electrodialysisPressure-retarded osmosisCapacitive mixingOsmosisThermally regenerative electrochemical cycleAlkali-metal thermal-to-electric conversionelectrolysisbattery intercalationredox flow storagesupercapacitor double layer storageelectrodepositioncorrosion cellbioelectrochemical oxidationelectrodialysiscapacitive deionisationelectrochemical heat pumpingthermally regenerative ammonia batterymixing entropy batteryelectro osmotic pumpingphotoelectrolysiselectrocatalytic co2 reductionhydrogen evolutionoxygen reductionion selective membrane transport

Condensed matter · 23 recorded · 38 missing

Acoustoelectric effectThermal shape-memory effectThermopolarization effectSeebeck effectPeltier effectThomson effectThermionic emissionPyroelectric effectNernst effectEttingshausen effectThermomagnetic (Curie-point) transitionMagnetocaloric effectElectrocaloric effectElastocaloric effectPhonon dragDirect piezoelectric effectConverse piezoelectric effectFlexoelectric effectVillari effectJoule magnetostrictionMagnetoelectric couplingHall effectPhotostrictionrighi leduc effectmaggi righi leduc effectbarocaloric effectmulticaloric effectsuperelasticityferroelectric switchingferromagnetic hysteresismagnetoresistancegiant magnetoresistancepiezoresistivitythermoresistivityelectrostrictionwiedemann effectmatteucci effectbarkhausen effectexciton diffusionhot carrier coolingimpact ionisationavalanche multiplicationtunnelling thermionic emissionphonon scattering limited conductionsuperconducting transitioncharge density wave slidingferroelectric photovoltaic effectthermal hall effectphonon hall effectelectron phonon drag thermopowerbipolar diffusiondember diffusion in solidsgrain boundary scatteringpiezomagnetismphotoconductivitythermoelastic dampingmagnetostrictive hysteresisband gap engineering responseminority carrier lifetime limitationpyromagnetic effectlaser cooling of solids

Fluid mechanics · 8 recorded · 18 missing

Marangoni effectElectrohydrodynamic generationThermomagnetic convectionAerodynamic and hydrodynamic liftFlow-induced vibrationTidal flowOcean wave motionAdvective heat transportdrag force extractionvortex sheddingventuri pressure drophydraulic jumpcapillary riseevaporation driven flowrayleigh benard convectionjet impingementcavitationwater hammerbuoyancy driven flowwind shear turbulenceoscillating water columnovertopping wave capturesiphon flowstratified flow mixingdroplet impactfilm flow drainage

Optics and photonics · 11 recorded · 19 missing

Radiation pressurePhoton drag effectPhoto-Dember effectThermal emissionRadiative sky coolingPhotothermal absorptionThermoradiative effectPhotovoltaic effectPhotoelectric effectPhoton-enhanced thermionic emissionBulk photovoltaic effectthermophotovoltaic conversionluminescent solar concentrationphoton upconversionphoton downconversionsinglet fissionplasmonic absorptionphotoacoustic effectoptical rectificationphotorefractive effectphotoisomerisation storagesolar thermal absorptionselective emissionnear field radiative transferlaser cooling of gasesoptical tweezingphotocatalysisfluorescencephotochromismstimulated emission

Spin systems · 7 recorded · 23 missing

Spin Nernst effectAnomalous Nernst effectSpin Hall effectInverse spin Hall effectSpin Seebeck effectSpin pumpingMagnon transportspin peltier effectspin dependent thermopowerrashba edelstein effectinverse rashba edelstein effectspin transfer torquespin orbit torquespin motive forceanomalous hall effectanomalous ettingshausen effectmagnon drag thermopowerspin thermionic emissionmagnetic tunnel junction magnetoresistancespin valve magnetoresistancedomain wall motionskyrmion motionmagnon spin current in insulatorsspin caloritronic coolingspin torque oscillationmagnetoelastic spin pumpingacoustic spin pumpingspin hall magnetoresistancethermal spin injectionspin mechanical coupling

Nuclear physics · 7 recorded · 13 missing

Alphavoltaic effectRadioluminescenceRadioactive decayRadioisotope heatingBetavoltaic effectNuclear fissionNuclear fusiongammavoltaic effectnuclear isomer storageneutron moderation heatingfission fragment direct conversionthermionic nuclear conversionradiation catalysed chemistrynuclear battery tritiumalpha recoilbeta decay electron emissiongamma heatingneutron capture heatingmuon catalysed fusionspontaneous fission

Plasma physics · 1 recorded · 19 missing

Magnetohydrodynamic generationplasma thermionic conversionelectron cyclotron heatingohmic plasma heatingplasma expansion direct conversioninverse cyclotron conversionarc discharge heatingglow dischargedielectric barrier dischargeplasma electrolysismagnetic mirror confinementambipolar diffusionplasma sheath potentialalfven wave heatinglaser plasma accelerationplasma torch pyrolysiselectrohydrodynamic thrustionic windz pinch compressionmagnetic nozzle expansion

Quantum transport · 2 recorded · 33 missing

Casimir effectInformation-to-work conversionquantum tunnellingresonant tunnellingcoulomb blockadesingle electron transportandreev reflectionjosephson effectinverse josephson effectquantum interference transportquantum pumpingquantum hall edge transportquantum dot thermoelectric transportquantum point contact thermopowerlandauer quantised conductancequantised thermal conductancephoton assisted tunnellingcooper pair splittingsuperconducting tunnel junction coolingnormal metal insulator superconductor refrigerationquantum heat enginequantum thermal rectificationdynamical casimir effectquantum ratchetbrownian motorstochastic resonancesingle photon detectionkondo thermopowerthermionic quantum well coolingphonon tunnellingquantum shuttlemesoscopic thermoelectric fluctuationselectron hydrodynamic flowhot electron bolometryfluctuation theorem work extraction

Biophysical transduction · 2 recorded · 28 missing

PhotosynthesisChemiosmosismyosin motorkinesin motordynein motoratp synthase rotationbacterial flagellar motorsodium potassium pumpcalcium pumpproton pump bacteriorhodopsinmechanosensitive channel gatinghair cell mechanotransductionactin polymerisation forcemicrotubule dynamic instabilitymuscle contractionelectric organ dischargebioluminescencephotoreceptor phototransductionthermogenesis uncouplingelectroreceptionmagnetoreceptionosmoregulation worknitrogenase reductionhydrogenase catalysisbiological fuel cell oxidationlight harvesting antenna transferrhodopsin isomerisationcilia beatingplant turgor motionvenom gland secretion work

Surfaces and interfaces · 5 recorded · 25 missing

Triboelectric effectReverse electrowettingStreaming potentialHydrovoltaic effectDroplet contact electrificationelectro osmosiselectrophoresisdiffusiophoresisdiffusio osmosisthermophoresis of colloidselectrocapillarityelectrowettingcapillary transportcontact line pinning releasewetting transitioncontact electrification solid liquidslide electrificationevaporation induced potentialmoisture electric generationinterfacial double layer chargingadsorption energy releasesurface tension actuationdewetting instabilitycondensation heat releasefrost formation worknanofluidic ion selectivitysurface plasmon heatingleidenfrost propulsionjumping droplet electrostaticscapillary condensation

Chemistry · 3 recorded · 22 missing

Thermochemical redox cycleCombustionEvaporationcatalytic oxidationexothermic hydrationchemical looping combustionreversible reaction heat storagemetal hydride absorptionammonia synthesis decompositionmethanationreformingpyrolysisgasificationphotochemical reactionmechanochemical reactionelectrochemical synthesiscrystallisation heat releasedissolution heatphase change material storagesalt hydrate storagesorption heat storagedetonationself propagating synthesischemiluminescenceosmotic heat engine solute

How to read the gaps

A low scope-fill bar means the atlas has not yet written down the phenomena on its own checklist for that domain, not that the domain lacks them. Nuclear, plasma, quantum-transport and biophysical domains are deliberately thin in this release.

"No search record" means exactly that. The atlas records a literature search only when one has been run, and it never infers absence of evidence from absence of a search. An automated index query that nobody has read marks a cell index query only; only a reviewed record can say no demonstration found. This revision has 13 reviewed search records and 16 index-only runs.

Scope targets are maintained checklists of phenomena the atlas intends to represent in its first broad release. They are editorial and revisable; they are not estimates of the total number of phenomena that exist. Lengthening a checklist lowers the bar; that is the point.