condensation vs fossil fuel

condensation

noun
  • The conversion of a gas to a liquid. 

  • The condensate so formed. 

  • The state of being condensed. 

  • when a single idea (an image, memory, or thought) or dream object stands for several associations and ideas. 

  • The reaction of two substances with the simultaneous loss of water or other small molecule. 

  • The act or process of condensing or of being condensed 

fossil fuel

noun
  • Any fuel derived from hydrocarbon deposits such as coal, petroleum, natural gas and, to some extent, peat; these fuels are non-renewable, and their burning moves carbon from underground into the atmosphere via the greenhouse gas carbon dioxide. 

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