The Pitch Drop Experiment was created by UQ’s foundation Professor of Physics, Thomas Parnell, in 1927 and is now the longest running scientific experiment in the world. The experiment demonstrates that pitch, while appearing to be a solid, is actually an extremely dense liquid. In the 83 years since the experiment began, eight drops of pitch have fallen. It falls at such a slow rate because pitch has a viscosity of approximately 100 billion times that of water. You can see the experiment for yourself in the foyer of the Parnell Building (Building 7) on the Great Court.  

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School of Mathematics and Physics