# 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 represents a ratio of surface tension to the momentum-transport (especially dissipation) inside a fluid.

It is defined as follows:

where:

- σ = surface tension
- ρ = density
- L = length
- μ = liquid viscosity

Laplace number is related to Reynolds number (Re) and Weber number (We) in the following way:

## See also

- Ohnesorge number - There is an inverse relationship, , between the Laplace number and the Ohnesorge number.

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