Does gravity effect viscosity ?is viscosity independent od gravity ?

[phymatter]

does gravity effect viscosity ?
is viscosity independent od gravity ?

 

[edgepflow]

For practical purposes on the surface of the earth, I would think gravity would only affect viscosity if you have a column of fluid tall enough to raise the pressure enough to change the viscosity. In other words,

P = Po + density X g X h

Since viscosity is a weak function of pressure, there is minimal effect on the Earth's surface.

In the vacuum of space with almost zero absolute pressure, however, the change could be significant enough to account for.

 

[Bill_K]

Like the man says, the viscosity of a substance is a function of pressure and temperature only, and is not directly affected by gravity.