Viskoziteli

Viskoziteli is a term of Slavic origin, meaning viscosity. Viscosity is a fundamental property of fluids that describes their resistance to flow. It is a measure of the internal friction within a fluid. Imagine honey versus water. Honey is much more viscous than water because its molecules are more strongly attracted to each other, creating greater resistance to movement when the fluid is stirred or poured.

The unit of dynamic viscosity in the International System of Units (SI) is the pascal-second (Pa·s). Another common unit is the poise (P), which is equal to 0.1 Pa·s. Kinematic viscosity, on the other hand, is the ratio of dynamic viscosity to density. Its SI unit is the square meter per second (m²/s), and a common non-SI unit is the Stokes (St), which is equal to 1 cm²/s or 0.0001 m²/s.

Factors influencing viscosity include temperature and pressure. For most liquids, viscosity decreases as temperature increases. For gases, the opposite is true; viscosity generally increases with temperature. Pressure has a less significant effect on viscosity, though it can be noticeable at very high pressures. Understanding viscosity is crucial in many fields, including engineering, physics, chemistry, and biology, for applications ranging from lubrication and fluid dynamics to the study of biological fluids and the flow of magma.