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B Why does ice piece sticks on hand but not wood piece?

  1. Feb 13, 2017 #1
    Why does ice piece sticks on hand but not wood piece?
     
  2. jcsd
  3. Feb 13, 2017 #2

    BvU

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    Hello Nitesh, :welcome:

    Good question ! The answer is that heat from your hand easily melts a bit of ice and the cold ice re-freezes that bit.
    For the transition from wood to ice:
    • the wood is generally also a bit colder
    • the heat resistance is bigger:
      • the wood doesn't deform, so the contact area is small and
      • wood is a bad conductor for heat
    It is not true that ice doesn't stick to wood at all: when the ice thaws a bit and then refreezes it can become quite well attached.
     
  4. Feb 13, 2017 #3

    anorlunda

    Staff: Mentor

    @BvU 's answer is correct.

    It reminds me of the case when a child at my front door in winter touched a metal rail with his tongue. The tongue stuck to the rail which was very painful. But the child's clothes did not stick for the reason that @BvU said.
     
  5. Feb 13, 2017 #4
    Tongue sticks because it was wet. The saliva freezes and acts as a bond. If your hand is dry, it probably won't stick to the ice.
     
  6. Feb 13, 2017 #5

    anorlunda

    Staff: Mentor

    That's part of what @BvU said in #2, but not the whole story. Ice on the cold object supplies the water. It is heat from the touching object that can melt some of that ice, only to have it refreeze a moment later that causes the problem. Flesh is warm and is a good heat conductor. The exterior surface of a glove is cold and a good insulator.
    .
     
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