Fluids Viscosity

What is Viscosity? A measure of how easily a fluid’s particles are able to slide past one another. A fluid’s “thickness” or resistance to flow. Two major factors that affect the fluids ability to flow are: Cohesion Adhesion. For the following video, how does this experiment relate to viscosity? Viscosity Demo

Cohesion Cohesion is the force of attraction between the particles of a substance. Particles stick together. Greater cohesion = lesser flow rate = more viscous Some fluids, such as caramel, are so viscous that they fold over on themselves.

Adhesion Adhesion is the force of attraction between particles of a fluid and particles of other substances. Fluid particles adhere to the sides of containers, pipes, and tubing (e.g., milk in a glass). Adhesion causes gases and liquids to travel faster near the centre of pipes and tubes than at the edges. But slows down the overall flow of fluid.

Homework Questions Describe the relationship between flow rate and viscosity. A: In your own words, define cohesion. B: Research to find what surface tension is. A: How does adhesion affect flow rate? B: Explain why fluids travel faster near the centre of pipes and tubes than at the edges.