What is the value of viscosity of water at 20 C?

Ans: The viscosity of water at 20°C is 1.002 centipoise.

Since,

1 poise = 0.1 N.s/m^2 = 0.1 Pa.s

Therefore viscosity of water at 20°C is 0.001002 N.s/m^2 (or Pa.s)