Viscosity is one of the properties of liquids and is defined as the resistance offered by the layers of the liquid. It is mainly related to fluids.
What is viscosity?
Viscosity is defined as the measure of the resistance of a fluid to gradual deformation by shear or tensile stress. In other words, viscosity describes a fluid’s resistance to flow. Simply put, we can say that honey is thicker than water, in turn, honey is more viscous than water.
Viscosity is the measure of the friction of fluids. There are two ways to measure a fluid’s viscosity as follows:
- Dynamic Viscosity (Absolute Viscosity)
- Kinematic Viscosity
SI unit of viscosity
- The SI unit of viscosity is the pascal second (Pa·s) or kg m−1s−1
- The SI unit of kinematic viscosity is square meter per second or m2s-1
Following are the properties of viscosity:
- Viscosity is a means of measurement of the movement of particles over one another.
- It depends on the attractive force between the molecules.
- Viscosity is dependent on the structural features of the molecules.
- The viscosity of the liquid can be decreased by increasing the temperature.