#conduction__conductivity  the transmission of heat or electricity or sound
  supertype:  #physical_phenomenon  a natural phenomenon involving the physics of matter and energy
  subtype:  #electrical_conduction  the passage of electricity through a conductor
     subtype:  #photoconductivity__photoconduction  change in the electrical conductivity of a substance as a result of absorbing electromagnetic radiation
     subtype:  #superconductivity  the disappearance of electrical resistance at very low temperatures
     subtype:  #electric_discharge__discharge__spark__arc__electric_arc  electrical conduction through a gas in an applied electric field
        subtype:  #brush_discharge  discharge between electrodes creating visible streamers of ionized particles
        subtype:  #corona_discharge__corona__corposant__st.elmo'sfire__Saint_Elmo's_fire__Saint_Elmo's_light__Saint_Ulmo's_fire__Saint_Ulmo's_light__electric_glow  an electrical discharge accompanied by ionization of surrounding atmosphere

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