] The differential equation of salt conservation for flowing seawater is u \frac{\partial S}{\partial x}+v \frac{\partial S}{\partial y}+w \frac{\partial S}{\partial z}=\kappa\left(\frac{\partial^{2} S}{\partial x^{2}}+\frac{\partial^{2} S}{\partial y^{2}}+\frac{\partial^{2} S}{\partial z^{2}}\right) where K is

a (constant) coefficient of diffusion, with typical units of square meter per second, and S is the salinity in parts per thousand. Non dimensionalize this equation and discuss any dimensionless parameters which appear.