The Pitch Drop experiment is a long-term experiment which measures the flow of a piece of pitch over many years. The experiment was started in 1927 by Professor Thomas Parnell of the University of Queensland in Brisbane, Australia, to demonstrate to students that some substances that appear to be solid are in fact very-high-viscosity fluids.
Large droplets form and fall over the period of about a decade. The eighth drop fell on 28 November 2000. And now, after more than 13 years, the ninth drop has collided with the eight in the bottom of the beaker.
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