atmosphere vs mid-air

atmosphere

noun
  • The air in a particular place. 

  • The gases surrounding the Earth or any astronomical body. 

  • Extras in a scene who have no spoken lines. 

  • The conditions (such as music, illumination etc.) that can influence the mood felt in an environment. 

  • The apparent mood felt in an environment. 

  • A unit of measurement for pressure equal to 101325 Pa (symbol: atm) 

mid-air

noun
  • The middle of the air, as while in flight. 

How often have the words atmosphere and mid-air occurred in a corpus of books? (source: Google Ngram Viewer )