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Contracting substance under decreased pressure?

  1. Dec 6, 2006 #1
    I know this seems impossible, and it probably is, but is there a substance (a solid) that will contract under a decrease in pressure?
    If I place the substance in a sealed container at say atmospheric pressure and then suck out the air to make it almost a vacuum, I need the substance to have a smaller volume when the container is a vacuum than when it is at 1atm.
    The reason that I leave a very small possibility for there to be a such a substance is because I am wondering if the temperature of the substance will change when it is in a vacuum causing the volume to change as well.

  2. jcsd
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