Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Wetness and why materials change shape

  1. May 6, 2013 #1

    kosovo dave

    User Avatar
    Gold Member

    Why is is that certain materials -- like plastic, metal (assuming it doesn't rust), glass -- retain their shape when they get wet, and some materials -- like paper -- don't return to their original shape even after they become dry again?

    My knowledge of chemistry is pretty limited, but my initial guess would be that it has something to do with polarity or new bonds forming/old bonds breaking.
     
  2. jcsd
  3. May 8, 2013 #2
    Hi...

    For metals and some kinds of plastic does not have a strong attraction with water molecules,
    so it is not affected when they become wet.
    While materials containing hydroxyl groups like paper attached to water molecules by hydrogen bonding and swell .
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Wetness and why materials change shape
Loading...