What is the unit for measuring viscosity of a fluid? How is that calculated?

Answer 1

The SI physical unit of dynamic viscosity (Greek symbol: μ) is the pascal-second (Pa·s), which is identical to 1 kg·m−1·s−1. In France there have been some attempts to establish the poiseuille (Pl) as a name for the Pa·s but without international success. Care must be taken in not confusing the poiseuille with the poise named after the same person!

The cgs physical unit for dynamic viscosity is the poise (P) named after Jean Louis Marie Poiseuille. It is more commonly expressed, particularly in ASTM standards, as centipoise (cP). The centipoise is commonly used because water has a viscosity of 1.0020 cP (at 20 °C; the closeness to one is a convenient coincidence).

For measuring you use a viscosimeter !

Answer 2

Viscosity is a measure of the resistance of a fluid to deform under shear stress. It is commonly perceived as "thickness", or resistance to pouring. Viscosity describes a fluid's internal resistance to flow and may be thought of as a measure of fluid friction. Thus, water is "thin", having a lower viscosity, while vegetable oil is "thick" having a higher viscosity. All real fluids (except superfluids) have some resistance to shear stress, but a fluid which has no resistance to shear stress is known as an ideal fluid or inviscid fluid

Answer 3

poise i.e., cm^2/s or simply mu( i m not able to find that symbol)

Viscosity changes according to the temperature as temperature rises viscosity decreases.

It is measured by viscometers eg. Redwoods viscometer

Answer 4

it must be N/m^2
newton per metre square.
coz viscosity is nothing but tangential force per unit area exerted by a fluid.

Answer 5

poise