Condensation \Con`den*sa"tion\, n. [L. condensatio: cf. F.
   condensation.]
   1. The act or process of condensing or of being condensed;
      the state of being condensed.
      
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            He [Goldsmith] was a great and perhaps an unequaled
            master of the arts of selection and condensation.
                                                  --Macaulay.
      
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   2. (Physics) The act or process of reducing, by depression of
      temperature or increase of pressure, etc., to another and
      denser form, as gas to the condition of a liquid or steam
      to water.
      
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   3. (Chem.) A rearrangement or concentration of the different
      constituents of one or more substances into a distinct and
      definite compound of greater complexity and molecular
      weight, often resulting in an increase of density, as the
      condensation of oxygen into ozone, or of acetone into
      mesitylene.
      
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   {Condensation product} (Chem.), a substance obtained by the
      polymerization of one substance, or by the union of two or
      more, with or without separation of some unimportant side
      products.

   {Surface condensation}, the system of condensing steam by
      contact with cold metallic surfaces, in distinction from
      condensation by the injection of cold water.
      
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