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Published on Dec 21, 2012

MAKE Contributing Editor William Gurstelle recreates the vacuum forming experiment performed by Otto von Guericke in the 17th Century. You can do it, too.

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Top Comments

  • ter450

    ter450 5 months ago

    Don't think they had youtube back in the 17th Century.

    · 20

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    in reply to strhunter666 (Show the comment)
  • Bp1033

    Bp1033 5 months ago

    Yeah they did, it was called ThyCrystal ball back then.

    · 12

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    in reply to ter450 (Show the comment)

All Comments (21)

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  • Leo Freeman

    Leo Freeman 4 months ago

    Probably an even more effective method is to fill up the cavity with steam by boiling water in it for a while, that drives out most of the air leaving only water vapour which then condenses out.

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    in reply to riothero313 (Show the comment)
  • riothero313

    riothero313 4 months ago

    It's nothing that complicated. The candle creates heat (pressure) and that is pushing out the air through the gap. Once all the oxygen is used up the flame dies out, when this happens the air inside cools causing a pressure drop and the two sides press down on the gasket through atmospheric pressures.

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    in reply to Leo Freeman (Show the comment)
  • TreyGarlow

    TreyGarlow 4 months ago

    I never knew Jeff Bridges was sciency!?!?

    ·

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  • Andrew Schreck

    Andrew Schreck 4 months ago

    bESMNk-4520

    meh, show us how to make the pump, that would be an interesting build...

    ·

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  • moosefarms

    moosefarms 5 months ago

    sweet

    ·

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  • Leo Freeman

    Leo Freeman 5 months ago

    Wow, after a bit of reading, I'm amazed at just how mistaken some science teachers and text books are in the way they explain 'basic' concepts.

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    in reply to wildfireman13 (Show the comment)
  • wildfireman13

    wildfireman13 5 months ago

    Don't be sorry, that is actually a common misconception

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    in reply to Leo Freeman (Show the comment)
  • Leo Freeman

    Leo Freeman 5 months ago

    You're right, sorry, my mistake. Each O2 molecule burned would just be replaced by a new CO2. I was thinking of that old experiment where water rises up a test tube as the iron fillings inside get rusty.

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    in reply to wildfireman13 (Show the comment)
  • wildfireman13

    wildfireman13 5 months ago

    It does remove the oxygen, but that is not what creates the vacuum.

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    in reply to Leo Freeman (Show the comment)
  • Leo Freeman

    Leo Freeman 5 months ago

    Nice demo. Just for correctness, though, wouldn't the burning process remove the oxygen, not the water vapor, from the cavity?

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