conductivity vs strength

conductivity

noun
  • The ability of a material to conduct electricity, heat, fluid or sound 

  • The reciprocal of resistivity 

strength

noun
  • The intensity of a force or power; potency. 

  • The quality or degree of being strong. 

  • The strongest part of something; that on which confidence or reliance is based. 

  • A positive attribute. 

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