dissolving vs liquefaction

dissolving

noun
  • The act by which something dissolves. 

liquefaction

noun
  • The liquid or semiliquid that results from this process. 

  • Process of being, or state of having been, made liquid (from either a solid or a gas) 

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