Individual #physics__physic__physical_science__natural_philosophy__naturalphilosophy  the science of matter and energy and their interactions
  >part:  acoustics  astronomy  aeronautics  biophysics  cryogenics  crystallography  electromagnetics  electronics  electrostatics  mechanics  nuclear_physics  optics  particle_physics  plasma_physics  quantum_physics  rheology  solid-state_physics  statistical_mechanics  thermodynamics
  part:  wave_theory_of_light  corpuscular_theory_of_light  kinetic_theory_of_gases  Einstein's_theory_of_relativity  quantum_theory
  type:  natural_science  the sciences involved in the study of the physical world and its phenomena

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