How is viscosity determined experimentally?

Falling sphere viscometer The viscosity of a liquid can also be determined by experiments with a ball sinking into the liquid. The speed at which a ball sinks to the ground in a fluid is directly dependent on the viscosity of the fluid. The fluids used are mainly liquids.

How coefficient of viscosity is determined?

The coefficient of viscosity of a fluid is defined as the tangential force per unit area, when the change of velocity per unit distance at right angles to the velocity is unity.

Which method is used to determine the coefficient of viscosity of fluid?

Poiseuille’s method
The Poiseuille’s method is formally used to estimate the coefficient of viscosity, in which the liquid flows through a tube at the different level of pressures. The coefficient of viscosity of fluids will be decreased as the temperature increases, while it is inverse in the case of gases.

What apparatus is used for viscosity determination experiment?

A viscometer (also called viscosimeter) is an instrument used to measure the viscosity of a fluid.

What is viscosity briefly explain principle and experimental procedure to determine viscosity coefficient of a liquid with respect to water using Ostwald viscometer?

Ostwald viscometer is use to determine viscosity of Newtonian fluid. When the liquid flow by gravity time required for the liquid to pass between two mark A and B through the capillary tube is determined.

Which equation can be used to determine experimentally the dynamic viscosity of a fluid?

Dynamic viscosity is the resistance to movement of one layer of a fluid over another and is defined by Formula F7. 8. Kinematic viscosity is dynamic viscosity divided by density (Formula F7.

What do you understand by viscosity coefficient describe any one method for the determination of viscosity coefficient?

viscosity: The Coefficient of Viscosity The ratio of the shearing stress to the velocity gradient is a measure of the viscosity of the fluid and is called the coefficient of viscosity η, or η=Fx/Av. A striking result of the kinetic theory of gases is that the viscosity of a gas is independent of the density of a gas.

What does coefficient of viscosity depend on?

Area of the layer in contact. Velocity gradient between two layers.

What is the difference between viscosity and coefficient of viscosity?

Viscosity is a resistance induce between two adjacent layer of liquid while it flows. While coefficient of viscosity is tendency of that resistance.

How does a viscosity determine viscometer?


  1. Ostwald viscometer is use to determine viscosity of Newtonian fluid.
  2. η1 can be determine using following equation.
  3. η1=ʆ1t1/ ʆ2t2 X η2
  4. ʆ1=Density of unknown liquid.
  5. t1 =Time of flow of unknown liquid.
  6. ʆ2 =Density of standard liquid.
  7. t2 =Time of flow of standard liquid.
  8. η2=Viscosity of standard liquid.

What is the aim of viscosity experiment?

The purpose of this experiment is to measure the viscosity of unknown oil with a falling ball viscometer. The principle of the viscometer is to determine the falling time of a sphere with known density and diameter within a fluid filled inside glass tube.

What is the formula used for determination of relative viscosity by Ostwald’s method?

η=KL/w, Where, L = the angular momentum in Newton meters, w = the angular speed in radians per second.

How to determine the viscosity of a liquid?

A very simple method for determining viscosity is the dip cup viscometer. This method makes use of the fact that the discharge of a liquid through a hole in a vessel also depends on the viscosity. Due to the high flow resistance, highly viscous liquids take a relatively long time to flow out through a hole in the dip cup.

What is the viscosity of glycerin experiment 6?

Experiment 6: Viscosity (Stoke’s Law) Viscosity is a property of uids (liquids and gases) which determines how much resistance is experienced by an objecttrying to move through the uid. In this experiment we will use Stoke’s Law and the concept of terminal velocity todetermine the viscosity of glycerin.

What is viscometry?

Viscometry is the experimental determination of the viscosity of liquids and gases with so-called viscometers. Viscosity describes the internal resistance to flow of a fluid (internal friction).

How do you test the viscosity of a capillary tube?

In order to study the temperature influence on the viscosity, the tube is usually placed in another tube filled with water. Circulating thermostats can be used to precisely control the temperature of the water bath and thus the liquid to be examined. The capillary viscometer is based on the Hagen-Poiseuille law for pipe flows.