List of Major Branches of Physics

List of Major Branches of Physics

S. No.	Branch of Physics	Main Area of Study	Category / Scope / Applications
1	Classical Mechanics	Motion and forces	Studies the motion of objects, forces, energy and momentum; used in engineering, machinery and orbital calculations.
2	Quantum Mechanics	Atomic and subatomic systems	Explains matter and energy at microscopic scales; fundamental to semiconductors, lasers and quantum technologies.
3	Relativity	Space, time and gravity	Includes special and general relativity; explains high-speed motion, spacetime and gravitational effects.
4	Thermodynamics	Heat and energy	Studies heat, temperature, work, energy transfer and the laws governing physical processes.
5	Statistical Mechanics	Collective behaviour of particles	Connects microscopic particle behaviour with macroscopic properties such as pressure, temperature and entropy.
6	Electromagnetism	Electric and magnetic fields	Studies electric charges, currents, electromagnetic waves and fields; supports electrical engineering and communications.
7	Optics	Light and its behaviour	Studies reflection, refraction, interference, diffraction and image formation; applied in cameras, microscopes and telescopes.
8	Acoustics	Sound and vibrations	Studies sound waves, vibration, resonance and sound propagation; used in audio engineering and architectural design.
9	Atomic Physics	Atoms and electrons	Investigates atomic structure, energy levels, spectra and interactions between atoms and electromagnetic radiation.
10	Molecular Physics	Molecules and their interactions	Studies molecular structure, rotational and vibrational states, and interactions between molecules.
11	Nuclear Physics	Atomic nuclei	Studies protons, neutrons, nuclear reactions, radioactive decay, nuclear fission and fusion.
12	Particle Physics	Fundamental particles	Investigates quarks, leptons, bosons and fundamental interactions; includes research using particle accelerators.
13	Condensed Matter Physics	Solids and liquids	Studies the collective properties of materials, including superconductivity, magnetism and electronic behaviour.
14	Solid-State Physics	Solid materials	Focuses on the physical properties of solids, including crystals, semiconductors and electronic materials.
15	Plasma Physics	Ionized gases	Studies matter containing free electrons and ions; important in fusion research, space physics and industrial plasma applications.
16	Fluid Mechanics	Liquids and gases	Investigates fluid motion, pressure, viscosity and turbulence; applied in aerodynamics, hydraulics and meteorology.
17	Geophysics	Earth's physical properties	Uses physical principles to study Earth's interior, gravity, magnetic field, earthquakes and seismic waves.
18	Astrophysics	Physical processes in space	Applies physics to stars, planets, galaxies, black holes and other astronomical objects.
19	Cosmology	The universe as a whole	Studies the origin, evolution, large-scale structure and possible future of the universe.
20	Planetary Physics	Planets and moons	Investigates planetary interiors, atmospheres, magnetic fields, surfaces and physical evolution.
21	Biophysics	Living systems	Applies physics to biological structures and processes, including cell mechanics, molecular motion and biological imaging.
22	Medical Physics	Physics in healthcare	Applies physics to medical imaging, radiation therapy, nuclear medicine and radiation safety.
23	Computational Physics	Numerical modelling	Uses computer simulations and numerical methods to solve complex physical problems.
24	Mathematical Physics	Mathematical foundations	Develops mathematical methods, equations and theoretical frameworks used to describe physical systems.
25	Applied Physics	Practical applications	Applies physical principles to develop technologies, instruments, materials and engineering solutions.
26	Experimental Physics	Measurement and experiments	Tests physical theories through experiments, observations, instrumentation and precise measurements.
27	Theoretical Physics	Models and fundamental laws	Develops mathematical models and theories to explain and predict physical phenomena.
28	Nonlinear Physics	Complex dynamic systems	Studies systems in which outputs are not proportional to inputs, including chaos, pattern formation and nonlinear waves.
29	Nanophysics	Nanoscale systems	Investigates physical phenomena at nanometre scales, where quantum and surface effects can become important.
30	Optoelectronics	Interaction of light and electronics	Studies devices that generate, detect or control light using electronic processes, including LEDs, photodetectors and laser systems.
31	Quantum Field Theory	Quantum fields and particles	Combines quantum mechanics with special relativity to describe fundamental particles and their interactions.
32	Gravitational Physics	Gravity and spacetime	Investigates gravitational interactions, gravitational waves, black holes and tests of gravitational theories.
33	Atmospheric Physics	Atmospheres and weather processes	Studies atmospheric radiation, cloud physics, energy transfer and the physical processes underlying weather and climate.
34	Chemical Physics	Physical principles of chemistry	Uses quantum mechanics, thermodynamics and spectroscopy to investigate chemical structures, reactions and molecular behaviour.
35	Materials Physics	Material properties	Studies the relationships between the structure, composition and physical properties of materials for technological applications.
36	Magnetism	Magnetic materials and fields	Investigates magnetic phenomena, magnetic ordering and interactions; important in motors, sensors, storage and electronics.
37	Renewable Energy Physics	Energy conversion	Studies the physical principles of solar cells, wind energy, energy storage and other renewable-energy technologies.
38	Radiation Physics	Radiation and matter	Studies the production, propagation, measurement and interaction of ionizing and non-ionizing radiation with matter.
39	Astroparticle Physics	Particles from space	Investigates cosmic rays, neutrinos, dark matter candidates and other particle phenomena using astronomical observations.
40	Quantum Information Physics	Quantum information systems	Studies quantum information, entanglement, quantum communication and the physical foundations of quantum computing.

Notes:

Physics is commonly divided into classical physics, modern physics, theoretical physics, experimental physics and applied physics.
Classical physics includes mechanics, thermodynamics, electromagnetism and classical optics.
Modern physics includes quantum mechanics, relativity, atomic physics, nuclear physics and particle physics.
Some branches overlap or are subfields of others. For example, solid-state physics is closely related to condensed matter physics, while cosmology is a major area of astrophysics.
This list contains major and specialized branches; it is not an exhaustive list of every subfield of physics.

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List of Major Branches of Physics

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