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Explain the following observations:

  1. Water wets glass surface but does not wet the waxed glass surface. 
  2. A steel needle placed carefully on the surface of water does not sink.

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  1. Water wets glass surface but does not wet the waxed glass surface. 
    • water wets glass-adhesive force is stronger between water molecules and glass molecules.
       
  2. A steel needle placed carefully on the surface of water does not sink. 
    • surface of water acts/appears like an elastic stretched 2km due to forces of surface    tension.
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