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Archimedes number

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Also known as Ar

used to determine the motion of fluids due to density differences

Wikidata facts

Named after
Archimedes
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recommended unit of measurement
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via Wikidata · CC0

~4 min read

Encyclopedic overview

In viscous fluid dynamics, the Archimedes number (Ar), is a dimensionless number used to determine the motion of fluids due to density differences, named after the ancient Greek scientist and mathematician Archimedes.

It is the ratio of gravitational forces to viscous forces and has the form:

Excerpted from Wikipedia’s “Archimedes number” article, available under the CC BY-SA 4.0 licence.