Question

what is the shear stress in the fluid per unit velocity gradient called as?
A) apparent viscosity
B) kinematic viscosity
C) dynamic viscosity
D) shear strain ​

Answer 1

Explanation:

• In Newton's equation, constant of proportionality (μ) is known as absolute or dynamic viscosity.

• Newton's law of viscosity states that, shear stress is directly proportional to rate of change of velocity with respect to distance τ = μ (du / dy)

• Constant of proportionality (μ) = τ / (du / dy)

• Fluidity is defined as reciprocal of absolute viscosity.

• Viscosity is measured in terms of absolute viscosity or dynamic viscosity and kinematic viscosity.

• N-s / mm2 is the S.I. unit of absolute viscosity.

So your answer is option c