#chemical_phenomenon  a natural phenomenon involving chemistry (as changes to atoms or molecules)
  supertype:  #natural_phenomenon__naturalphenomenon  all non-artificial phenomena
  subtype:  #allotropy__allotropism  the phenomenon of an element existing in two or more physical forms
  subtype:  #exchange  chemical process in which one atom or ion or group changes places with another
     subtype:  #photochemical_exchange__photochemicalexchange  an exchange produced by the chemical action of radiant energy (especially light)
  subtype:  #crystallization__crystallizing  the formation of crystals
     subtype:  #efflorescence__bloom  a powdery deposit on a surface
  subtype:  #valency  the phenomenon of forming chemical bonds
  subtype:  #fermentation__ferment  a chemical phenomenon in which an organic molecule splits into simpler substances
  subtype:  #polymorphism.chemical_phenomenon__pleomorphism  (chemistry) the existence of different kinds of crystal of the same chemical compound
     subtype:  #dimorphism.polymorphism  (chemistry) the property of certain substances that enables them to exist in two distinct crystalline forms
  subtype:  #state_of_matter__state  (chemistry) the three traditional states of matter are solids (fixed shape and volume) and liquids (fixed volume and shaped by the container) and gases (filling the container); "the solid state of water is called ice"
     subtype:  #phase.state_of_matter__form  (physical chemistry) a distinct state of matter in a system; matter that is identical in chemical composition and physical state and separated from other material by the phase boundary: "the reaction occurs in the liquid phase of the system"
        subtype:  #dispersed_phase__dispersedphase__dispersed_particles__dispersedparticle  (of colloids) a substance in the colloidal state
        subtype:  #dispersing_phase__dispersion_medium__dispersing_medium  (of colloids) a substance in which another is colloidally dispersed
     subtype:  #liquidness__liquid__liquidity  the state in which a substance exhibits a characteristic readiness to flow with little or no tendency to disperse and relatively high incompressibility
     subtype:  #solidness__solidnes  the state in which a substance has no tendency to flow under moderate stress; resists forces (such as compression) that tend to deform it; and retains an definite size and shape
     subtype:  #gas.state_of_matter__ga  the state of matter distinguished from the solid and liquid states by: relatively low density and viscosity; relatively great expansion and contraction with changes in pressure and temperature; the ability to diffuse readily; and the spontaneous tendency to become distributed uniformly throughout any container
     subtype:  #plasma  (physical chemistry) the gaseous state of hot ionized material consisting of ions and electrons and present in the stars and fusion reactors: sometimes regarded as a fourth state of matter distinct from normal gasses

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