how to pronounce hardness


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An example use of hardness in a speech by a native speaker of american english:

“… voltage water hardness all these things …”

meanings of hardness


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