dampness vs exhalation

dampness

noun
  • The degree to which something is damp or moist. 

  • Moderate humidity; moisture; moistness; the state or quality of being damp. 

exhalation

noun
  • That which is exhaled, or which rises in the form of vapor, fume, or steam 

  • A bright phenomenon; a meteor. 

  • The act or process of exhaling; breathing out 

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