Cauchy number

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What Wikipedia says

The Cauchy number (Ca) is a dimensionless number in continuum mechanics used in the study of compressible flows. It is named after the French mathematician Augustin Louis Cauchy. When the compressibility is important the elastic forces must be considered along with inertial forces for dynamic similarity.

Excerpt from the Wikipedia article “Cauchy number”, under the CC BY-SA 4.0 license. Read the article on Wikipedia