surface condensation

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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Surface \Sur"face`\, n. [F. See {Sur-}, and {Face}, and cf.
   {Superficial}.]
   1. The exterior part of anything that has length and breadth;
      one of the limits that bound a solid, esp. the upper face;
      superficies; the outside; as, the surface of the earth;
      the surface of a diamond; the surface of the body.
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            The bright surface of this ethereous mold. --Milton.
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   2. Hence, outward or external appearance.
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            Vain and weak understandings, which penetrate no
            deeper than the surface.              --V. Knox.
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   3. (Geom.) A magnitude that has length and breadth without
      thickness; superficies; as, a plane surface; a spherical
      surface.
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   4. (Fort.) That part of the side which is terminated by the
      flank prolonged, and the angle of the nearest bastion.
      --Stocqueler.
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   {Caustic surface}, {Heating surface}, etc. See under
      {Caustic}, {Heating}, etc.

   {Surface condensation}, {Surface condenser}. See under
      {Condensation}, and {Condenser}.

   {Surface gauge} (Mach.), an instrument consisting of a
      standard having a flat base and carrying an adjustable
      pointer, for gauging the evenness of a surface or its
      height, or for marking a line parallel with a surface.

   {Surface grub} (Zool.), the larva of the great yellow
      underwing moth ({Triphoena pronuba}). It is often
      destructive to the roots of grasses and other plants.

   {Surface plate} (Mach.), a plate having an accurately dressed
      flat surface, used as a standard of flatness by which to
      test other surfaces.

   {Surface printing}, printing from a surface in relief, as
      from type, in distinction from plate printing, in which
      the ink is contained in engraved lines.
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