Meaning & use

Dilatancy

noun·Academic

Last updated

The property of certain granular or suspension materials to increase in volume or become more solid when subjected to shear stress or pressure.

See it in a sentence

The dilatancy of wet sand explains why it feels firm underfoot only when you press on it.

Engineers studied the dilatancy of the soil before designing the building's foundation.

A note on using this word

Dilatancy explains the classic "oobleck" phenomenon, in which a cornstarch-and-water mixture behaves like a solid under sudden pressure but flows like a liquid when left still.

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