Another use is in the estimation of gas holdup in a bubble column. In a bubble column, the gas holdup (fraction of a bubble column that is gas at a given time) can be estimated by:
where:
* is the gas holdup fraction
* is the Eötvos number
*  is the Froude number
*  is the diameter of holes in the column's spargers (holed discs that emit bubbles)
*  is the column diameter
* Parameters  to  are found empirically