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# Laplace number

The Laplace number (La), also known as the Suratman number (Su), is a dimensionless number used in the characterization of free surface fluid dynamics. It is represents a ratio of surface tension to the momentum-transport (especially dissipation) inside a fluid.

It is defined as follows:

$La = Su = \frac{\sigma \rho L}{\mu^2}\,$

where: