#compactness  the consistency of a compact solid
  supertype:  solidity.consistency__solidness__solidnes  the consistency of a solid
  subtype:  density__denseness__densenes  the amount per unit size
     subtype:  relative_density  the ratio of the density of something to the density of a standard
        subtype:  specific_gravity  the density of a substance relative to the density of water
        subtype:  vapor_density__vapordensity__vapour_density  the density of a gas relative to the density of hydrogen
     subtype:  rarity__tenuity__low_density__lowdensity  a rarified quality: "the tenuity of the upper atmosphere"

No statement uses or specializes compactness; click here to add one.