elasticity vs hardness

elasticity

noun
  • The property by virtue of which a material deformed under load can regain its original dimensions when unloaded 

  • The sensitivity of changes in a quantity with respect to changes in another quantity. 

  • A measure of the flexibility of a data store's data model and clustering capabilities. 

  • The ratio of the relative change in a function's output with respect to the relative change in its input, for infinitesimal changes at a certain point. 

  • A system's ability to adapt to changes in workload by automatically provisioning and de-provisioning resources. 

  • Adaptability. 

  • The quality of being elastic. 

hardness

noun
  • A measure of how hard a material is 

  • The quality of being hard. 

  • An instance of this quality; hardship. 

  • The resistance to scratching, cutting, indentation or abrasion of a metal or other solid material. 

  • The penetrating ability of electromagnetic radiation, such as x-rays; generally, the shorter the wavelength, the harder and more penetrating the radiation. 

  • The measure of resistance to damage of a facility, equipment, installation, or telecommunications infrastructure when subjected to attack. 

  • The quantity of calcium carbonate dissolved in water, usually expressed in parts per million (ppm). 

How often have the words elasticity and hardness occurred in a corpus of books? (source: Google Ngram Viewer )