Viscosity

Viscosity is a term that describes the resistance of substances to flow movements. Imagine you had a viscous syrup and tried to pour it - that is an example of a liquid with high viscosity. On the other hand, water would be a liquid with low viscosity, as it can be poured more easily and quickly.

This property is of crucial importance for understanding the behaviour of materials, especially those that are viscous or glue-like. When viscosity increases, the fluid becomes thicker, which means that it moves more slowly and exhibits higher internal friction. Conversely, low viscosity leads to a thinner fluid that can move more easily and offers less resistance to flow.

It is interesting to note that the viscosity of solid plastics is often difficult to determine, as they are in a solid state and do not flow like liquids. Instead of viscosity, we therefore often use terms such as ductility, brittleness and plasticity to describe the behaviour of solid materials under load.