#aerosol  a cloud of solid or liquid particles in a gas
  supertype:  cloud  any collection of particles ($('<' #physical_phenomenon replaced by #natural_object because #cloud.atmospheric_phenomenon already exists and a clous a color, a mass, ... like all natural objects)$ e.g., smoke or dust) or gases that is visible
  subtype:  fog  droplets of water vapor suspended in the air near the ground
     subtype:  fogbank  a large mass of fog on the sea (as seen from a distance)
     subtype:  ice_fog__icefog__pogonip  a dense winter fog containing ice particles
     subtype:  mist  a thin fog with condensation near the ground
     subtype:  pea-souper__peasouper__pea_soup__peasoup  a heavy thick yellow fog
  subtype:  haze  atmospheric moisture or dust or smoke that causes reduced visibility
  subtype:  fume__smoke  a cloud of fine particles suspended in a gas
     subtype:  gun_smoke__gunsmoke  smoke created by the firing of guns
     subtype:  smother  a stifling cloud of smoke

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