While researching fluid dynamics, you come across a reference to the dimensionless number...

While researching fluid dynamics, you come across a reference to the dimensionless number called the Laplace number, given by the equation below.

where:

ρ = fluid density [=] kg/m3

μ = fluid viscosity [=] g/(m s)

L = length [=] ft

What are the dimensions of delta, d?