condense vs prolong

condense

verb
  • To concentrate toward the essence by making more close, compact, or dense, thereby decreasing size or volume. 

  • To be transformed from a gaseous state into a liquid state. 

  • To transform from a gaseous state into a liquid state via condensation. 

prolong

verb
  • To extend in space or length. 

  • To lengthen in time; to extend the duration of 

  • To put off to a distant time; to postpone. 

  • To become longer; lengthen. 

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