This article does not cite any sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: "Laplace number" – news · newspapers · books · scholar · JSTOR (December 2009) (Learn how and when to remove this template message)

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:


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

See also