| 00-XX | - | GENERAL | 
                  
                    
                      | 01-XX | - | Communication, education, history, and philosophy | 
                  
                    
                      | 02-XX | - | Mathematical methods in physics | 
                  
                    
                      | 03-XX | - | Quantum mechanics, field theories, and special relativity (see also section 11 General theory of fields and particles) | 
                  
                    
                      | 04-XX | - | General relativity and gravitation (see also 95.30.Sf in astronomy) | 
                  
                    
                      | 05-XX | - | Statistical physics, thermodynamics, and nonlinear dynamical systems (see also 02.50.-r Probability theory, stochastic processes, and statistics) | 
                  
                    
                      | 06-XX | - | Metrology, measurements, and laboratory procedures (for laser applications in metrology, see 42.62.Eh) | 
                  
                    
                      | 07-XX | - | Instruments, apparatus, and components common to several branches of physics and astronomy (see also each subdiscipline for specialized instrumentation and techniques) | 
                  
                    
                      | 10-XX | - | THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS (for cosmic rays, see 96.40.-z in astronomy; for experimental methods and instrumentation for elementary-particle physics, see section 29) | 
                  
                    
                      | 11-XX | - | General theory of fields and particles (see also 03.65.-w Quantum mechanics and 03.70.+k Theory of quantized fields) | 
                  
                    
                      | 12-XX | - | Specific theories and interaction models; particle systematics | 
                  
                    
                      | 13-XX | - | Specific reactions and phenomenology | 
                  
                    
                      | 14-XX | - | Properties of specific particles | 
                  
                    
                      | 20-XX | - | NUCLEAR PHYSICS | 
                  
                    
                      | 21-XX | - | Nuclear structure (for nucleon structure, see 14.20.Dh Properties of protons and neutrons; 13.40.-f for electromagnetic processes and properties; 13.60.Hb for deep-inelastic structure functions) | 
                  
                    
                      | 23-XX | - | Radioactive decay and in-beam spectroscopy | 
                  
                    
                      | 24-XX | - | Nuclear reactions: general | 
                  
                    
                      | 25-XX | - | Nuclear reactions: specific reactions | 
                  
                    
                      | 26-XX | - | Nuclear astrophysics (see also 95.30.-k Fundamental aspects of astrophysics in astronomy) | 
                  
                    
                      | 27-XX | - | Properties of specific nuclei listed by mass ranges (an additional heading must be chosen with these entries, where the given mass number limits are, to some degree, arbitrary) | 
                  
                    
                      | 28-XX | - | Nuclear engineering and nuclear power studies | 
                  
                    
                      | 29-XX | - | Experimental methods and instrumentation for elementary-particle and nuclear physics | 
                  
                    
                      | 30-XX | - | ATOMIC AND MOLECULAR PHYSICS | 
                  
                    
                      | 31-XX | - | Electronic structure of atoms and molecules: theory | 
                  
                    
                      | 32-XX | - | Atomic properties and interactions with photons | 
                  
                    
                      | 33-XX | - | Molecular properties and interactions with photons | 
                  
                    
                      | 34-XX | - | Atomic and molecular collision processes and interactions (for atomic, molecular, and ionic collisions in plasma, see 52.20.Hv) | 
                  
                    
                      | 36-XX | - | Exotic atoms and molecules; macromolecules; clusters | 
                  
                    
                      | 39-XX | - | Instrumentation and techniques for atomic and molecular physics | 
                  
                    
                      | 40-XX | - | ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID MECHANICS | 
                  
                    
                      | 41-XX | - | Electromagnetism; electron and ion optics | 
                  
                    
                      | 42-XX | - | Optics (for optical properties of gases, see 51.70.+f; for optical properties of bulk materials and thin films, see 78.20.-e; for x-ray optics, see 41.50.+h) | 
                  
                    
                      | 43-XX | - | Acoustics | 
                  
                    
                      | 44-XX | - | Heat transfer | 
                  
                    
                      | 45-XX | - | Classical mechanics of discrete systems | 
                  
                    
                      | 46-XX | - | Continuum mechanics of solids (see also 83.10.Ff in rheology) | 
                  
                    
                      | 47-XX | - | Fluid dynamics (for fluid dynamics of quantum fluids, see section 67; see also section 83 Rheology) | 
                  
                    
                      | 50-XX | - | PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES | 
                  
                    
                      | 51-XX | - | Physics of gases | 
                  
                    
                      | 52-XX | - | Physics of plasmas and electric discharges (for astrophysical plasmas, see 95.30.Qd; for physics of the ionosphere and magnetosphere, see 94.20.-y and 94.30.-d respectively) | 
                  
                    
                      | 60-XX | - | CONDENSED MATTER: STRUCTURAL, MECHANICAL AND THERMAL PROPERTIES | 
                  
                    
                      | 61-XX | - | Structure of solids and liquids; crystallography (for surface, interface, and thin film structure, see section 68) | 
                  
                    
                      | 62-XX | - | Mechanical and acoustical properties of condensed matter (for mechanical properties of interfaces and thin films, see 68.35.Gy, and 68.35.Iv; and 68.60Bs; for mechanical and acoustical properties related to treatment conditions, see 81.40.Jj, Lm, Np in ma | 
                  
                    
                      | 63-XX | - | Lattice dynamics (see also 78.30.-j Infrared and Raman spectra; for surface and interface vibrations, see 68.35.Ja; for adsorbate vibrations, see 68.43.Pq) | 
                  
                    
                      | 64-XX | - | Equations of state, phase equilibria, and phase transitions (see also 82.60.-s Chemical thermodynamics) | 
                  
                    
                      | 65-XX | - | Thermal properties of condensed matter (see also 05.70.-a Thermodynamics and section 44 Heat transfer; for thermodynamic properties of quantum fluids and solids, see section 67; for thermal properties of thin films, see 68.60.Dv; for nonelectronic thermal | 
                  
                    
                      | 66-XX | - | Transport properties of condensed matter (nonelectronic) | 
                  
                    
                      | 67-XX | - | Quantum fluids and solids; liquid and solid helium (see also 05.30.-d Quantum statistical mechanics) | 
                  
                    
                      | 68-XX | - | Surfaces and interfaces; thin films and low-dimensional systems (structure and nonelectronic properties) (for surface and interface chemistry, see 82.65.+r, for surface magnetism, see 75.70.Rf) | 
                  
                    
                      | 70-XX | - | CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND | 
                  
                    
                      | 71-XX | - | Electronic structure of bulk materials (see section 73 for electronic structure of surfaces, interfaces, low-dimensional structures, and nanomaterials; for electronic structure of superconductors, see 74.25.Jb) | 
                  
                    
                      | 72-XX | - | Electronic transport in condensed matter (for electronic transport in surfaces, interfaces, and thin films, see section 73; for electrical properties related to treatment conditions, see 81.40.Rs; for transport properties of superconductors, see 74.25.Fy) | 
                  
                    
                      | 73-XX | - | Electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures (for electronic structure and electrical properties of superconducting films and low-dimensional structures, see 74.78.-w; for computational | 
                  
                    
                      | 74-XX | - | Superconductivity (for superconducting devices, see 85.25.-j) | 
                  
                    
                      | 75-XX | - | Magnetic properties and materials (for magnetic properties related to treatment conditions, see 81.40.Rs; for magnetic properties of superconductors, see 74.25.Ha; for magnetic properties of rocks and minerals, see 91.60.Pn) | 
                  
                    
                      | 76-XX | - | Magnetic resonances and relaxations in condensed matter, Mössbauer | 
                  
                    
                      | 77-XX | - | Dielectrics, piezoelectrics, and ferroelectrics and their properties (for conductivity phenomena, see 72.20.-i and 72.80.-r; for dielectric properties related to treatment conditions, see 81.40.Tv) | 
                  
                    
                      | 78-XX | - | Optical properties, condensed-matter spectroscopy and other interactions of radiation and particles with condensed matter | 
                  
                    
                      | 79-XX | - | Electron and ion emission by liquids and solids; impact phenomena | 
                  
                    
                      | 80-XX | - | INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND | 
                  
                    
                      | 81-XX | - | Materials science | 
                  
                    
                      | 82-XX | - | Physical chemistry and chemical physics | 
                  
                    
                      | 83-XX | - | Rheology (see also section 47 Fluid dynamics) | 
                  
                    
                      | 84-XX | - | Electronics; radiowave and microwave technology; direct energy conversion and storage | 
                  
                    
                      | 85-XX | - | Electronic and magnetic devices; microelectronics | 
                  
                    
                      | 87-XX | - | Biological and medical physics | 
                  
                    
                      | 89-XX | - | Other areas of applied and interdisciplinary physics | 
                  
                    
                      | 90-XX | - | GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS | 
                  
                    
                      | 91-XX | - | Solid Earth physics | 
                  
                    
                      | 92-XX | - | Hydrospheric and atmospheric geophysics | 
                  
                    
                      | 93-XX | - | Geophysical observations, instrumentation, and techniques | 
                  
                    
                      | 94-XX | - | Aeronomy and magnetospheric physics | 
                  
                    
                      | 95-XX | - | Fundamental astronomy and astrophysics; instrumentation, techniques, and astronomical observations | 
                  
                    
                      | 96-XX | - | Solar System (for the Earth, see sections 91-94) | 
                  
                    
                      | 97-XX | - | Stars | 
                  
                    
                      | 98-XX | - | Stellar systems; interstellar medium; galactic and extragalactic objects and systems; the Universe | 
                  
                 
                
                   
                
				
                
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