Individual #physics__physic__physical_science__natural_philosophy__naturalphilosophy  the science of matter and energy and their interactions
  instance of:  #natural_science
  part:  #wave_theory_of_light  #corpuscular_theory_of_light  #kinetic_theory_of_gases  #Einstein's_theory_of_relativity  #quantum_theory
  >part:  #acoustics__acoustic  the study of the physical properties of sound
     >part:  #harmonics__harmonic  the study of musical sound
     >part:  #phonetics__phonetic  the branch of acoustics concerned with speech processes including its production and perception and acoustic analysis
  >part:  #astronomy__uranology  the branch of physics that studies celestial bodies and the universe as a whole
     >part:  #astrodynamics__astrodynamic  the branch of astronomy that studies the motion of natural and artificial bodies in space
     >part:  #astrometry  the branch of astronomy that deals with the measurement of the position and motion of celestial bodies
     >part:  #radio_astronomy__radioastronomy  the branch of astronomy that detects and studies the radio waves emitted by celestial bodies
     >part:  #celestial_mechanics__celestialmechanic  the branch of astronomy concerned with the application of Newton's laws of motion to the motions of heavenly bodies
     >part:  #astrophysics  the branch of astronomy concerned with the physical and chemical properties of celestial bodies
        >part:  #cosmogony__cosmology  the branch of astrophysics that studies the origins and structure of the universe
     >part:  #solar_physics__solarphysic  the branch of astronomy that deals with the sun
  >part:  #aeronautics__aeronautic__astronautics  the theory and practice of navigation through air or space
     >part:  #avionics  science and technology of electronic systems and devices for aeronautics and astronautics: "avionics has become even more important with the development of the space program"
  >part:  #biophysics  physics as applied to biological problems
  >part:  #cryogenics__cryogeny  the branch of physics that studies the phenomena that occur at very low temperatures
  >part:  #crystallography  the branch of science that studies the formation and structure of crystals
  >part:  #electromagnetics__electromagnetism  the branch of physics concerned with electromagnetic phenomena
  >part:  #electronics__electronic  the branch of physics that deals with the emission and effects of electrons and with the use of electronic devices
     >part:  #electron_optics  the branch of electronics that deals with beams of electrons and their focusing and deflection by magnetic fields
     >part:  #microelectronics  the branch of electronics that deals with miniature components
     >part:  #thermionics__thermionic  the branch of electronics dealing with thermionic phenomena (especially thermionic vacuum tubes)
  >part:  #electrostatics  the branch of physics that deals with static electricity
  >part:  #mechanics__mechanic  the branch of physics concerned with the motion of bodies in a frame of reference
     >part:  #classical_mechanics__classicalmechanic__Newtonian_mechanics  the branch of mechanics based on Newton's laws of motion
     >part:  #fluid_mechanics__fluidmechanic__hydraulics  study of the mechanics of fluids
        >part:  #hydrostatics  study of the mechanical properties of fluids that are not in motion
        >part:  #hydrodynamics__hydrodynamic__hydrokinetics__hydrokinetic  study of fluids in motion
           >part:  #magnetohydrodynamics  the study of the interaction of magnetic fields and electrically conducting fluids (as plasma or molten metal)
     >part:  #pneumatics  the branch of mechanics that deals with the mechanical properties of gases
     >part:  #statics__static  the branch of mechanics concerned with forces in equilibrium
     >part:  #dynamics__kinetics  the branch of mechanics concerned with the forces that cause motions of bodies
        >part:  #ballistics  the science of flight dynamics
     >part:  #kinematics  the branch of mechanics concerned with motion without reference to force or mass
     >part:  #aeromechanics__aeromechanic__aerodynamics  the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow
  >part:  #nuclear_physics__nuclearphysic__atomic_physics__nucleonics  the branch of physics that studies the internal structure of atomic nuclei
  >part:  #optics  the branch of physics that studies the physical properties of light
     >part:  #catoptrics  branch of optics dealing with formation of images by mirrors
     >part:  #holography  the branch of optics that deals with the use of coherent light from a laser in order to make a hologram that can then be used to create a three-dimensional image
  >part:  #particle_physics__high-energy_physics  the branch of physics that studies subatomic particles and their interactions
  >part:  #plasma_physics  the branch of physics concerned with matter in its plasma phase
  >part:  #quantum_physics  the branch of physics based on quantum theory
     >part:  #quantum_mechanics__quantummechanic  the branch of quantum physics that accounts for matter at the atomic level; an extension of statistical mechanics based on quantum theory (especially the Pauli exclusion principle)
        >part:  #wave_mechanics  the modern form of quantum theory; an extension of of quantum mechanics based on Schrodinger's equation; atomic events are explained as interactions between particle waves
     >part:  #quantum_field_theory__quantumfieldtheory  the branch of quantum physics that is concerned with the theory of fields; it was motivated by the question of how an atom radiates light as its electrons jump from excited states
        >part:  #quantum_electrodynamics__quantumelectrodynamic__QED  a relativistic quantum theory of the electromagnetic interactions of photons and electrons and muons
        >part:  #quantum_chromodynamics__QCD  a theory of strong interactions between elementary particles (including the interaction that binds protons and neutrons in the nucleus); it assumes that strongly interacting particles (hadrons) are made of quarks and that gluons bind the quarks together
  >part:  #rheology  the branch of physics that studies the deformation and flow of matter
  >part:  #solid-state_physics__solidstatephysic  the branch of physics that studies the properties of materials in the solid state: electrical conduction in crystals of semiconductors and metals; superconductivity; photoconductivity
  >part:  #statistical_mechanics__statisticalmechanic  the branch of physics that makes theoretical predictions about the behavior of macroscopic systems on the basis of statistical laws governing its component particles
  >part:  #thermodynamics  the branch of physics concerned with the conversion of different forms of energy
     >part:  #thermostatics__thermostatic__thermodynamics_of_equilibrium  the aspect of thermodynamics concerned with thermal equilibrium

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