How Do You Measure Viscosity Using A Viscometer?

Also known as u-tube or glass viscometers, capillary viscometers are often used in laboratory settings. Viscosity is measured

by timing how long it takes for a transparent or translucent fluid to flow between two points of a capillary tube.

How does a viscometer measure viscosity?

The EMS viscometer measures the viscosity of

liquids through observation of the rotation of a sphere driven by electromagnetic interaction

: Two magnets attached to a rotor create a rotating magnetic field. The sample 3 to be measured is in a small test tube 2. Inside the tube is an aluminium sphere 4.

How do you measure viscosity?

1. Capillary Viscometers. …
2. Rotational Rheometry. …
3. Vibrating Viscometers. …
4. Microfluidic Rheometers. …
5. Non-Contact Rheology. …
6. Viscosity Measurements with Formulaction.

What are two ways to measure viscosity?

1. Capillary Viscometers. …
2. Rotational Rheometry. …
3. Vibrating Viscometers. …
4. Microfluidic Rheometers. …
5. Non-Contact Rheology. …
6. Viscosity Measurements with Formulaction.

What is used to measure viscosity?

A viscometer, viscosity meter or rheometer

is a measuring instrument used to determine a fluid’s internal flow resistance or viscosity.

What are the dimensions of viscosity?

The dimensions of dynamic viscosity are

force × time ÷ area

. The unit of viscosity, accordingly, is newton-second per square metre, which is usually expressed as pascal-second in SI units.

How do you measure blood viscosity?

A small dropping needle type viscometer (FNR)

is a viscometer that can measure the viscosity and flow characteristics of a fluid from the terminal velocity of a small cylindrical needle (weight) that naturally falls within the fluid. FNR was developed for blood viscosity measurement.

What causes higher viscosity?

Viscosity generally

increases as the temperature decreases

. The viscosity of a liquid is related to the ease with which the molecules can move with respect to one another. Thus the viscosity of a liquid depends on the: strength of attractive forces between molecules, which depend on their composition, size, and shape.

Is high viscosity thick or thin?

Viscosity describes a fluid’s internal resistance to flow and may be thought of as a measure of fluid friction. Thus, water is “thin”, having a low viscosity, while

vegetable oil is “thick” having a high viscosity

.

Why do we measure viscosity?

Gathering viscosity data on a material gives manufacturers the ability to predict how the material will behave in the real world

. For example: if toothpaste does not have the correct viscosity, it can either be too difficult to pump out from the tube, or pump out too much.

What is the CGS unit of viscosity?

The physical unit for dynamic viscosity in the centimeter gram second system of units (cgs) is

the poise (P)

, named after Jean Poiseuille. It is more commonly expressed, particularly in ASTM standards, as centipoise

How do you measure viscosity at home?

1. Capillary Viscometer. The earliest methods for measuring viscosity were based on using capillary tubes and measuring the time it took for a volume of liquid to pass through the length of the tube. …
2. Zahn Cup. …
3. Falling Sphere Viscometer. …
4. Vibrational Viscometer. …
5. Rotational Viscometer.

What is the dimension of kinematic viscosity?

and has the dimensions

L

²

T

^{− 1}

and the units m

²

s

^{− 1}


. It may be regarded as a measure of the relative magnitudes of fluid viscosity and inertia and has the practical advantage, in calculations, of replacing two values representing μ and ρ with a single value.

What is absolute viscosity of water?

Equation (1) is known as the Newtons Law of Friction. Water at 20.2

^o

C (68.4

^o

F) has the absolute viscosity of

one – 1 – centiPoise

.

What are the dimensions of Reynolds number?

In simple words, the Reynolds number is the ratio of the inertial forces