Pitch is the name for any of a number of highly
viscous liquids which appear
solid. Pitch can be made from
petroleum products or plants. Petroleum-derived pitch is also called
bitumen. Pitch produced from plants is also known as
resin. Products made from plant resin are also known as
rosin.Tar pitch appears solid, and can be shattered with a hard impact, but it is actually fluid. Pitch flows at room temperature, but extremely slowly. The
pitch drop experiment taking place at
University of Queensland is a long-term experiment which measures the flow of a piece of pitch over many years. For the experiment, pitch was put in a glass container with a hole in the bottom, and allowed to slowly drip out. Since the pitch was allowed to start dripping in
1930, only eight drops have fallen. It was calculated in the 1980s that the pitch in the experiment has a viscosity approximately 100
billion (1011) times that of water.
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