What You Need to Know.doc

Hardy 3603110313 What You Need to Know A fluid isagas oraliquid. The measurement ofhow easily afluid flows iscalled viscosity . How Does Viscosity Work? Friction isaforce that opposes the motion ofobjects that are incontact with one another. For afluid toflow, its particles must move across one another. Soviscosity isameasure ofthe friction among the particles ofafluid. What Does This Have to Do with Finding the Viscosity of Different Fluids? The greater the friction among the particles ofafluid, the greater is the viscosity and the slower isthe motion ofthe fluid. For example, the frictional forces among the particles inhoney are much greater than the frictional forces among the particles inwater. Sothe viscosity ofhoney isgreater than the viscosity ofwater. Thickness isalso anindication ofviscosity. The more viscous the fluid, the thicker itis. Honey ismore viscous and thicker than water. Another observation ofhigh viscosity is how smoothly aliquid pours. When thick honey ispoured into abowl, it pours smoothly, while thinner water, with amuch lower viscosity, splashes about. Real-Life Science Challenge Many fluids get thicker and more viscous when they get colder and thinner and less viscous when they are heated. The viscosity ofmultiweight motor oil used incars isspecified using two numbers, such as10W30. The first number, 10, isthe viscosity ofthe oil when itiscold. The let