fluidity vs stability

fluidity

noun
  • A measure of the extent to which something is fluid. The reciprocal of its viscosity. 

  • The quality of being fluid or free-flowing 

  • The state of being fluid rather than viscous 

stability

noun
  • The condition of being stable or in equilibrium, and thus resistant to change. 

  • The tendency to recover from perturbations. 

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