In 1927, Professor Thomas Parnell of the University of Queensland in Brisbane, Australia,

craved at an experiment to demonstrate to his students the concept of viscosity and how some

substances which appear to be solids are actually liquids.

That experiment is still running 90 years later.

Learn more about the Pitch Drop Experiment, the world's longest continually running scientific experiment on this episode of Everything Everywhere Daily. This episode is sponsored by Fluent in three months. Have you ever wanted to learn a foreign language and do so quickly?

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The concept of viscosity is one which mostly concerns physicists who are interested in

fluid dynamics, but also one which can be easily

comprehended from everyday experience. Viscosity is simply a fluid's

resistance to defamation at a given rate. Water has a very low viscosity. Olive oil has a higher viscosity.

Honey has a still higher viscosity and ketchup is usually higher than that.

Basically, the longer it takes something to pour pour the higher its viscosity.

Viscosity can also get much higher than something like ketchup.

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