The Pitch Drop Experiment

10 08 2009

Possibly the most unusual post I’ve written, the Pitch Drop Experiment is the world’s longest running lab experiment according to Guinness.


Notice how large of a drop that is in the picture there.  Pitch is a rather peculiar substance.  It appears solid and can be shattered with a hammer.  But some folks argued that it was indeed a highly viscous liquid, and in 1927 a fella by the name of Thomas Parnell set up this simple experiment to prove it.

It took eight years for the first drop to fall.  The second took nine.

It has dropped every 8 to 9 years since, and the pitch has now dripped eight times in the last 79 years.  With some quick back-of-the-envelop calculations, that makes it approximately 230 billion times more viscous than water.  The last time was in 2000, which by my reckoning was 9 years ago — meaning we’re due.  If you’d like to watch in the hopes that you can say, “I was there when the pitch dropped!”, there’s a webcam set up here:  mms://  [You’ll have to copy/paste for yourself. WordPress is uncooperative once again.] That webcam was set up before the last time in 2000, but there was a technical problem and it missed the drip.  So no one has ever actually witnessed a drip!

If you’d like to see this for yourself, just drop in at the University of Queensland in Brisbane, Australia.  [Heh!  Drop in!  Get it?  I’m so clever…]  Not visiting there for a while?  I’m sure it’ll still be going.  There’s enough pitch left in the funnel to last another 100 years.

[Inspiration for (blatant theft of) this article came from Atlas Obscura, which is just an awesome website all the way around.]




4 responses

11 08 2009

Sure, *now* you tell me! I was in Brisbane last week (well, at the airport, anyway), and tomorrow we’re leaving for Auckland to visit Andrew. I mean, getting to see the Southern Cross with my own eyes, watching penguins walk up the beach to their nests, and petting a koala, those were all fun and all, but seeing pitch drop … *sigh*


11 08 2009

That is totally awesome, and for the past hour I’ve been staring at a blob of pitch. I find myself strangely drawn to it. What they need to do is set up 78,840 of those, an hour apart, so that pitch will drop about every hour for nine years and start all over again… except for the stupid “variable” thingies you scientifics keep talking about.

11 08 2009
Máire of the Lilies

Oh my goodness! This is hilarious! Talk about crazy science experiments. And I thought I wouldn’t have any entertaining stuff to watch for the next year.

And Kevin (my boss) says, “So, there IS something more boring than watching paint dry!”.

Heh heh heh. Um… wait, I’m trying to use the link to watch the pitch drop but it isn’t working… hmmmmm…

And I’m stoked that “Eve” got to see the penguins! They’re so very cute.

8 05 2010

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