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
  instance of:  natural_science
  part:  wave_theory_of_light__wave_theory__undulatory_theory  the theory that light is transmitted as waves
  part:  corpuscular_theory_of_light__corpuscular_theory__corpusculartheory  the theory that light is transmitted as a stream of particles
  part:  kinetic_theory_of_gases__kinetictheoryofgase__kinetic_theory__kinetictheory  a theory that gases consist of small particles in random movement
  part:  Einstein's_theory_of_relativity__relativity__theory_of_relativity__relativity_theory  (physics) the theory that space and time are relative concepts rather than absolute concepts
  part:  quantum_theory__quantumtheory  a physical theory that certain properties occur only in discrete amounts (quanta)
     part:  uncertainty_principle__uncertaintyprinciple__indeterminacy_principle__indeterminacyprinciple  the theory that it is impossible to measure both energy and time (or position and momentum) completely accurately at the same time

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