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Density of water and bonds.

  1. Mar 1, 2005 #1
    ok so 20 degrees celcius water, then you cool it. density increases until 4 degrees. if u cool it more, density decreases.

    Why is that?

    does it have to do with the type on polar bonds water has?
  2. jcsd
  3. Mar 1, 2005 #2
    Yes. Its because of the type of INTER-molecular forces that water has. I presume you know about hydrogen bonding, with the hydrogens becoming slightly positive and the oxygen negative.

    When water freezes, the water molecules form a lattice (hydrogen bond lattice) which maximises the amount of space inbetween. Thats why water, when frozen, has lower density than when it was liquid.
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