I think "kinematic viscosity" is a more important criterion than specific gravity.
Regards, Neil Tucson, AZ
What you talkin'bout Willis
,Can you please explain why Sir, ??
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Specific gravity isn't what is important in this case- it is only a measure of density. Two fluids can have similar specific gravity but one can pour like water and the other like Karo syrup.
The term "Viscosity" is pretty well understood since we all use an oil of some viscosity number in our engines, etc. "Kinematic" viscosity is the apparent thickness (resistance to flow) of a fluid when it is flowing fast through a small hose, orifice, fuel injector, etc. Viscosity of many fluids changes as the flow rate increases.
An extreme example of this is a "Non-Newtonian" fluid. Drop a marble into a pan of it and it hits the surface and sinks to the bottom as one would expect. However, if it hits the surface at high speed, the fluid acts like concrete.
These questions may be on the Final Exam.
Regards, Neil Tucson, AZ