Why do we prefer to measure relative viscosity of a liquid compared to absolute viscosity?

Relative viscosity: Relative viscosity is important for non-Newtonian fluids, specifically polymers. It refers to the relationship between molar mass (the mass of a chemical compound divided by total amount) and viscosity — higher molar mass means higher viscosity in the polymer.

What is the unit of kinematic viscosity?

The kinematic viscosity [m2/s] is the ratio between the dynamic viscosity [Pa. s = 1 kg/m·s] and the density of a fluid [kg/m3]. The SI unit of the kinematic viscosity is m2/s. Other units are: 1 St (Stoke) = 1 cm2/s = 10−4 m2/s.

How is kinematic viscosity measured?

Kinematic viscosity is measured by noting the time it takes oil to travel through the orifice of a capillary under the force of gravity (Figure 1). The orifice of the kinematic viscometer tube produces a fixed resistance to flow. Different sized capillaries are available to support fluids of varying viscosity.

What is the SI unit of kinematic viscosity and dynamic viscosity?

A common unit of dynamic viscosity is poise. (2) Kinematic Viscosity: The ratio of dynamic viscosity to density appears frequently and this ratio is given by the name kinematic viscosity. Its unit is Stoke or m2/s (1 stoke = 0.0001 m2 /s). ∴ SI unit of kinematic viscosity is m2/s.

How are dynamic and kinematic viscosity related?

Simply put, dynamic viscosity gives you information on the force needed to make the fluid flow at a certain rate, while kinematic viscosity tells how fast the fluid is moving when a certain force is applied.

How is kinematic viscosity defined?

The kinematic viscosity is defined as the absolute viscosity of a liquid divided by its density at the same temperature.

What is unit of kinematic viscosity Mcq?

Kinematic viscosity: It is defined as the ratio between the dynamic or absolute viscosity and density of the fluid, Units of Kinematic viscosity: The SI unit of kinematic viscosity is m2/s and the C.G.S. unit of kinematic viscosity is cm2/s or stokes. 1 stoke = 10-4 m2/s.

What is the difference between viscosity and kinematic viscosity?

Dynamic viscosity (also known as absolute viscosity) is the measurement of the fluid’s internal resistance to flow while kinematic viscosity refers to the ratio of dynamic viscosity to density.

What is the difference between kinematic viscosity and dynamic viscosity?

Kinematic viscosity incorporates fluid density as part of its measurement. Thus, dynamic viscosity is a measure of force, while kinematic viscosity is a measure of velocity. That’s the difference. If you divide kinematic viscosity by the fluid density, you get absolute viscosity.

What is kinematic viscosity equation?

It is the ratio of the dynamic viscosity to its density, a force independent quantity. Kinematic viscosity can be obtained by dividing the absolute viscosity of a fluid with the fluid mass density. Kinematic viscosity = Dynamic viscosity / Fluid mass density. The equation is written. ν = η / ρ

What does kinematic viscosity depend upon?

The kinematic viscosity is an atmospheric variable defined as the ratio between the dynamic viscosity μ and the density ρ of the fluid, i.e. and depends on both air temperature and pressure.