Viscosity

Viscosity is a measure of a fluid's resistance to flow or how thick and sticky it is. Think of honey and water: honey has high viscosity, meaning it flows slowly and is thick, while water has low viscosity, flowing easily and quickly. Viscosity depends on the strength of internal friction within the fluid—stronger friction makes the fluid thicker. Factors like temperature can change viscosity: heating a liquid usually decreases its viscosity, making it flow more easily. Understanding viscosity helps in applications like lubricants, cooking, and engineering to ensure proper function and performance.