Why does a glass of milkshake "hop" if you blow through a straw?

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Ray Burger

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Ray Burger  asked the Naked Scientists:
   
Good day Chris,

Something which has had my mind puzzled ever since I started drinking milkshake is..... why does the glass hop on the table if you give a short pulse blow through the straw. The straw should be vertical and quite deep into the shake. I've only tried this with long glasses.

Thanks,

Ray Burger

What do you think?
« Last Edit: 28/02/2011 19:30:02 by _system »