#conservation.principle  (physics) the maintenance of a certain quantities unchanged during chemical reactions or physical transformations
  supertype:  principle.natural_law  a basic truth or law or assumption: "the principles of democracy"
  subtype:  conservation_of_charge__conservation_of_electricity  the principle that the total electric charge of a system remains constant despite changes inside the system
  subtype:  law_of_conservation_of_energy__conservation_of_energy__first_law_of_thermodynamics  the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes
  subtype:  law_of_conservation_of_mass__lawofconservationofmas__conservationofmas__conservation_of_matter__law_of_conservation_of_matter  a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system
  subtype:  conservation_of_momentum  the principle that the total linear momentum in a closed system is constant and is not affected by processes occurring inside the system
  subtype:  conservation_of_parity__parity__space-reflection_symmetry__mirror_symmetry  (physics) parity is conserved in a universe in which the laws of physics are the same in a right-handed system of coordinates as in a left-handed system

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