artesian well vs effusion

artesian well

noun
  • An aquifer in which water rises to the surface under its own hydrostatic pressure. 

  • A bore-hole in an artesian basin. 

effusion

noun
  • A liquid outpouring. 

  • Process of gases passing through a hole or holes considerably smaller than the mean free path of the gas molecules. 

  • An outpouring of speech or emotion. 

  • The seeping of fluid into a body cavity; the fluid itself. 

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