hardness vs ruggedness what difference

what is difference between hardness and ruggedness



From Middle English hardness, hardnesse, from Old English heardness, from heard + -ness. Equivalent to hard +‎ -ness.


  • (General American) enPR: härdʹnəs, IPA(key): /ˈhɑɹdnəs/
  • (Received Pronunciation) IPA(key): /ˈhɑːdnəs/
  • Hyphenation: hard‧ness


hardness (countable and uncountable, plural hardnesses)

  1. The quality of being hard.
  2. An instance of this quality; hardship.
  3. (inorganic chemistry) The quantity of calcium carbonate dissolved in water, usually expressed in parts per million (ppm).
  4. The resistance to scratching, cutting, indentation or abrasion of a metal or other solid material.
  5. (physics) The penetrating ability of electromagnetic radiation, such as x-rays; generally, the shorter the wavelength, the harder and more penetrating the radiation.
  6. The measure of resistance to damage of a facility, equipment, installation, or telecommunications infrastructure when subjected to attack.


See also

  • hardiness


  • hardness in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.


  • Dashners



rugged +‎ -ness


ruggedness (countable and uncountable, plural ruggednesses)

  1. The state of being rugged, or degree to which something is rugged. [from 16th c.]
  2. A rugged or irregular feature. [from 17th c.]
    • 1665, Robert Hooke, Micrographia, I:
      The surface of which […] could not nevertheless hide a multitude of holes and scratches and ruggednesses from being discover’d by the Microscope to invest it […].

Derived terms

  • ruggedness number


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