What is viscosity?

What is viscosity?

Viscosity, or viscosity, is a measure of a liquid or gas's resistance to deformation or the movement of adjacent parts relative to each other. This property indicates how a fluid flows and has a direct impact on its behavior and application in various industries. For example, water has low viscosity and honey has high viscosity, which creates different expectations in different environments.

Factors Affecting Viscosity

Several factors affect viscosity:
1. Temperature: Increasing temperature reduces viscosity, while decreasing temperature increases it.
2. Pressure: Pressure can also affect viscosity.
3. Shear rate: Changes in shear rate can influence the viscosity level.
4. Environmental conditions: Different environmental conditions can impact the behavior of the fluid.

Types of Viscosity

1. Dynamic (absolute) viscosity: Indicates the resistance of a fluid to shear flows.
2. Kinematic viscosity: The ratio of absolute viscosity to the fluid's density.
3. Bulk viscosity: Related to the change in volume of a fluid under sudden expansion or contraction.

Importance of Viscosity in Adhesives

The viscosity of adhesives plays an important role in the efficiency and strength of bonds. Low-viscosity adhesives flow easily, while high-viscosity adhesives require more force to flow. This characteristic helps users choose the appropriate adhesive for different materials and conditions.


A viscometer is a device used to measure the viscosity of fluids. There are various types of viscometers, including:
1. U-tube viscometer
2. Falling sphere viscometer
3. Vibrational viscometer
4. Rotational viscometer
5. Brookfield viscometer
6. Stabinger viscometer
7. Krebs viscometer


Viscosity is one of the most important properties of fluids, directly impacting their application and performance. To achieve optimal results in the use of adhesives, attention must be paid to their viscosity, and quality products from reputable brands should be used.

Leave your comment