University of Queensland - AustraliaUniversity of Queensland - ExperimentPitch drop experiment with demarcation of yearsPitch drop experiment with demarcation of years and monthsPitch drop experiment - Chart of months between drops (1938 - 2014)

Pitch drop – The longest laboratory experiment

Pitch drop – Prof. Thomas Parnell from the Australian University of Queensland wanted to show students that some substances, although they appear to be constant. In fact, they are very viscous liquids. He poured hot tar into the glass, sealed funnel . More precisely the so-called coal tar, which is forming by distillation of tar. He waited three years and opened the funnel.
The tar began to flow down at such a slow pace that only after a few years a drop formed at the end of the funnel. After a decade, it broke away and fell into the dish. This has happened nine times since 1927.

The last drop fell in 2014, another should fall in about nine years.

Pitch drop experiment conducted in Australia in 2005 got Ig Nobel. Project recognized as the longest-lasting laboratory experiment. It went to the “Guinness Book of Records”. They can even be viewed using a webcam (broadcasts are monitored by several hundred people a day).

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