Table of Contents
- 1 What is significance of absolute and kinematic viscosity?
- 2 What is molecular viscosity?
- 3 What is the kinematic viscosity of oil?
- 4 What is kinematic viscosity of air?
- 5 What is the kinematic viscosity of castor oil?
- 6 What is the kinematic viscosity of water at 20 C?
- 7 What is the lowest viscosity?
- 8 What units are used to measure viscosity?
What is significance of absolute and kinematic viscosity?
The same meaning as the word viscosity used alone, to distinguish from empirical viscosity or kinematic viscosity. This represents the ratio of a fluid’s shear stress to its velocity gradient. It is a fluid’s internal flow resistance. The absolute viscosity divided by the fluid’s density gives the kinematic viscosity.
What is the physical significance of dynamic and kinematic viscosity?
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.
What is molecular viscosity?
At a molecular level, viscosity is a result the interaction between the different molecules in a fluid. This can be also understood as friction between the molecules in the fluid. Just like in the case of friction between moving solids, viscosity will determine the energy required to make a fluid flow.
How does kinematic viscosity determine dynamic viscosity?
A basic difference between the dynamic and kinematic viscosity measurements is density. Density actually provides a way to convert between a kinematic and a dynamic viscosity measurement. The formula for the conversion is: Kinematic (cSt) x Density = Dynamic (cP)
What is the kinematic viscosity of oil?
An oil’s kinematic viscosity is defined as its resistance to flow and shear due to gravity. Imagine filling a beaker with turbine oil and another with a thick gear oil.
What is kinematic viscosity of a fluid?
Kinematic viscosity is a measure of a fluid’s internal resistance to flow under gravitational forces. It is determined by measuring the time in seconds, required for a fixed volume of fluid to flow a known distance by gravity through a capillary within a calibrated viscometer at a closely controlled temperature.
What is kinematic viscosity of air?
The kinematic viscosity of air at 15 °C is 1.48 × 10-5 m2 /s or 14.8 cSt. At 25 °C, the viscosity is 18.6 μPa·s and the kinematic viscosity 15.7 cSt.
Where is kinematic viscosity used?
Kinematic viscosity is an important property of fuel, which directly influences the fuel atomization quality and size of the fuel droplet in the spray. In general, kinematic viscosity is measured using the ASTM Standard D445 and EN 3104 test methods.
What is the kinematic viscosity of castor oil?
Kinematic viscosity (experimental) of Castor oil, ethoxylated( CAS No. 61791-12-6) at 40°C and 60°C was 252.0882 mm²/sec and 243.3691 mm²/s,respectively.
What is the kinematic viscosity of honey?
Viscosity of some Common Liquids
centiStokes (cSt, 10-6 m2/s, mm2/s) | Saybolt Second Universal (SSU, SUS) | Typical liquid |
---|---|---|
1100 | 5000 | Glycerine (20oC) SAE 250 Gear Oil |
2200 | 10000 | Honey |
6250 | 28000 | Mayonnaise |
19000 | 86000 | Sour cream |
What is the kinematic viscosity of water at 20 C?
about 1 cSt
Water at 20 °C has a kinematic viscosity of about 1 cSt.
What is the difference between high and low viscosity?
The difference between high and low viscosity is the thickness of the material being measured. Low viscosity refers to substances that are thin, such as water, while high viscosity substances are thick.
What is the lowest viscosity?
Water, milk and blood, with viscosities of 1 cP, 3 cP and 10 cP at room temperature, respectively, are low viscosity fluids. The motor oil with the lowest viscosity at room temperature is the SAE 10, with a viscosity between 85 and 140 cP.
What is difference between kinematic and dynamic quantity?
Key Difference: Kinematics will give you the values of change of objects, while dynamics will provide the reasoning behind the change in the objects. Kinematics and dynamics are two branches of Classical Mechanics that deals with the motion of particles.
What units are used to measure viscosity?
The standard unit used to measure viscosity is the centistoke (cSt). According to the Automotive and Industrial Lubricants Glossary of Terms: Viscosity is ordinarily expressed in terms of the time required for a standard quantity of the fluid at a certain temperature to flow…