👓 The Pitch Drop Experiment | Atlas Obscura

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Begun in 1927 by Professor Thomas Parnell, this experiment was meant to reveal the surprising properties of an everyday material: pitch. Pitch is the name of a number of hard tar-like substances and in this case, bitumen was used. Though at room temperature pitch appears to be a solid and can be shattered by a hammer, it is, in fact, a very high-viscosity liquid, and Professor Parnell wanted to prove it.