Pitch (resin)

Pitch is the name for any of a number of highly viscous liquids which appears 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.

Unlike glass, pitch flows at room temperature, very very slowly. The pitch drop experiment is a long-term experiment which measures the flow of a piece of pitch over many years.