empty space vs vacuity

empty space

noun
  • Vacuum; a space containing nothing at all 

  • An unoccupied space where something may be stored 

  • A feeling of longing for someone or something that is gone; a sense of a thing's absence. 

  • An unoccupied area or volume. 

vacuity

noun
  • Physical emptiness, an absence of matter; vacuum. 

  • Idleness; listlessness. 

  • Emptiness. 

  • An empty or inane remark or thing. 

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