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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