## How does a capillary viscometer measure viscosity?

To obtain kinematic viscosity (v = ny), multiply the measured flow time (tf) by the so-called capillary constant (KC). This constant needs to be determined for each capillary by calibrating the capillary, i.e. by measuring a reference liquid of known viscosity.

## What are the units of the viscometer constant?

The S.l. unit of viscosity is 1 pascal second, and is equal to 10 poises. One centistokcs is equal to one millimeter squared per second. The viscometer constant at other temperatures can be obtained by interpolation or extrapolation.

What does a viscometer measure?

Viscometers are instruments that measure the fluid flow and viscosity of liquids. The viscosity of a liquid can affect its performance, whether this is pumping or piping it, or how it performs for dipping and coating. Measuring viscosity, therefore, applies to a wide range of materials, including: Oil.

### Is poiseuille a SI unit?

The poiseuille (symbol Pl) has been proposed as a derived SI unit of dynamic viscosity, named after the French physicist Jean Léonard Marie Poiseuille (1797–1869).

### Are centiStokes and Centipoise the same?

Centipoise = centistokes x specific gravity where specific gravity is assumed to be 0.8 (except for water). To find the exact cp of your fluid: cp = cSt x (weight per gallon x 0.120).

What type of material can be determined using the capillary viscometer?

In most glass capillary viscometers, the samples flow under gravity, but vacuum viscometers can be used to measure highly viscous materials. Vacuum viscometers require a very accurately controlled vacuum to pull the liquid through the capillary.

## What are the examples of capillary viscometer?

Usage Examples Capillary viscometers are used to measure the viscosity of a wide range of diverse fluids. Common examples include petroleum products, lubricants, adhesives, and sealants.

## What is a capillary viscometer?

Capillary viscometers are the simplest form of viscometer available from which it is possible to obtain absolute values of viscosity for Newtonian fluids and to obtain limited information on power law fluids. The basic measurement made is of the time t taken for a fixed volume V of the test fluid to pass through a length L of capillary tubing.

What is the viscometer constant at 100 degrees Celsius?

Viscomctcr Constant at 100°C 0.01456 0.01065 The viscometer constant at other temperatures can be obtained by interpolation or extrapolation. To obtain kinematic viscosity in mm2/s (cSt) multiply the efflux time in seconds by the viscometer constant.

### How do you find the kinematic viscosity of a capillary?

The time for a fixed amount of fluid to flow through the capillary tube is measured under given measurement conditions, and the kinematic viscosity is obtained by multiplying that time by the viscometer constant.

### What is the value of B for this viscometer?

Cannon determines the viscometer constants using two different standards, then takes the average of the two constants. One standard is normally sufficient whenever a user recalibrates his or her viscometer. In this particular case, a constant of 2.540 mm2!s2 was found. The value ofB for this viscometer is 81 x lO-6/oC.