It describes the internal friction of a moving fluid. A fluidwith large viscosity resists motion because its molecular makeup gives it a lot of internal friction.
How is viscosity determined?
There are several formulas and equations to calculate viscosity, the most common of which is Viscosity = (2 x (ball density – liquid density) x g x a^2) ÷ (9 x v) , where g = acceleration due to gravity = 9.8 m/s^2, a = radius of ball bearing, and v = velocity of ball bearing through liquid.
What is viscosity of a liquid?
Viscosity, resistance of a fluid (liquid or gas) to a change in shape, or movement of neighbouring portions relative to one another. Viscosity denotes opposition to flow . The reciprocal of the viscosity is called the fluidity, a measure of the ease of flow. Molasses, for example, has a greater viscosity than water.
What is viscosity equal to?
It is the force per unit area, so viscosity is equal to force divided by area .
What is viscosity based on?
Even for a Newtonian fluid, the viscosity usually depends on its composition and temperature . For gases and other compressible fluids, it depends on temperature and varies very slowly with pressure. The viscosity of some fluids may depend on other factors.
What causes viscosity?
Viscosity is a measure of the resistance of a fluid towards being deformed when under shear stress. Hence, it is also known as shear viscosity. It is caused by the attractive forces between molecules in close contact, and the friction between molecular chains .
What is the SI unit of viscosity poiseuille?
Pascal-second (symbol: Pa·s) This is the SI unit of viscosity, equivalent to newton-second per square metre (N·s m–2). It is sometimes referred to as the “poiseuille” (Pl). One poise is exactly 0.1 Pa·s. One poiseuille is 10 poise or 1000 cP, while 1 cP = 1 mPa·s (one millipascal-second).
What is CGS unit of viscosity?
A poise is the centimetre-gram-second (cgs) unit of viscosity. It expresses the force needed to maintain a unit... In gas: Viscosity. ...still often used is the poise (1 Pa · s = 10 poise).
What is the aim of viscosity experiment?
To measure the viscosity of a sample liquid . Introduction: Viscosity is a measure of the resistance of a fluid which is being deformed by either shear stress or tensile stress.
Is viscosity a vector?
Viscosity is the measurement of a “thickness” of a liquid. ... To say that a fluid has a viscosity of East makes no sense. Viscosity is a scalar quantity . Displacement, force, velocity, and acceleration all have associated directions and are classified as vector quantities.
What is viscosity volcano?
The most important factor in determining the shape or type of volcano is the viscosity of the magma that builds the volcano . Viscosity is a measure of a fluid material’s resistance to flow and results from the internal forces and friction between the material’s molecules.
What is the symbol for viscosity?
The SI unit for absolute (dynamic) viscosity is Ns/m 2 (or 1Kg/ms). Also in common use is Poise (P) although this is often quoted as cP (centiPoise). The symbol for absolute (dynamic) viscosity is mu: μ (although eta η is also sometimes used).
Why is viscosity important?
Viscosity of a liquid is an important parameter as it can be used as an indicator of quality by the consumer , in some instances a thicker liquid being thought of as superior quality when compared to a thinner product. Viscosity is also a characteristic of the texture of food.
What are the two different types of viscosity?
Viscosity is a fundamental material property when studying fluid flow for any application. The two most common types of viscosity are dynamic and kinematic . The relationship between these two properties is quite straightforward.
