#flux_density__flux  (physics) the number of flux changes per unit area
  supertype:  #denseness__densenes__density__compactness  the spatial property of being crowded together
  subtype:  #flux_density_unit  a measure of the amount of flux per unit of cross sectional area
     subtype:  #microgauss  a unit of magnetic flux density equal to one millionth of a gauss
     subtype:  #gauss__gaus  a unit of magnetic flux density equal to 1 maxwell per square centimeter
     subtype:  #tesla  a unit of magnetic flux density equal to one weber per square meter

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