Can anyone tell me how viscosity is related to mass so that it can be used in an equation?

Thanks,

Viscosity- the property of a fluid that resists the force tending to cause the fluid to flow
Mass- the quantity of matter as determined from its weight or from Newton's second law of motion
Hope this helps.

Thank you,
However, to be a bit more specific, I am looking for the relationship (if any exists) between mass and viscosity. This would allow for substitution into an equation such as F=m/2 * v^2 and account for the viscosity of the material, thereby obtaining the change in force as it relates to the material's viscosity for a given speed.

Thanks,

Viscosity would be better realated to density, rather than mass.

Since density is mass/volume, I suppose there's a relationship there, but what is it will be different for different fluids.