Viscosity definition :
Viscosity is the property of a fluid which determines its resistance to shearing stresses.
Cause of Viscosity:
It is due to cohesion and molecular momentum exchange between fluid layers.
Newton’s Law of Viscosity:
It states that the shear stress (τ) on a fluid element layer is directly proportional to the rate of shear strain.
Viscosity and density are two same terms but there is a difference between them. Let we check it out the difference between viscosity and density.
Viscosity is the property of a fluid which determines its resistance to shearing stresses.
Cause of Viscosity:
It is due to cohesion and molecular momentum exchange between fluid layers.
Newton’s Law of Viscosity:
It states that the shear stress (τ) on a fluid element layer is directly proportional to the rate of shear strain.
T = µ (du/dy)
Where µ = Coefficient of dynamic viscosity
Units of Viscosity :
S.I Units : Pa.s or
N.s/m2
C.G.S Unit of viscosity
is Poise = dyne-sec/cm2
One Poise = 0.1 Pa.s
1/100 Poise is called
centipoises.
Dynamic viscosity of
water at 20 0C is approx= 1 cP
Kinematic Viscosity :
Kinematic viscosity is the ratio between the dynamic viscosity and density of the fluid.
It is denoted by ν.
ν = dynamic viscosity / density
Units of Kinematic Viscosity :
S.I units: m2/s
C.G.S units: stoke = cm2/sec
One stoke = 10-4
m2/s
Viscosity and density are two same terms but there is a difference between them. Let we check it out the difference between viscosity and density.