contortion vs tortuosity

contortion

noun
  • The act of contorting, twisting or deforming something, especially oneself. 

  • A form of acrobatic display which involves the dramatic bending and flexing of the human body. 

tortuosity

noun
  • tortuousness; tortuous condition or nature. 

  • A property of curve being tortuous, commonly used to describe diffusion in porous media. 

  • Crookedness. 

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