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