Viscosity PDF

Viscosity Objective:- To measure the coefficient of viscosity (η) of glycerin using Stoke’s Law. Apparatus:- 1- Glass tube 2- Steel balls of different sizes 3- stand and clamps 4- Weighing balance 5- Stopwatch, 6- Sample liquid (glycerin) 7- Rubber bands for marking calibration points 8- Ruler 9-...

Viscosity Objective:- To measure the coefficient of viscosity (η) of glycerin using Stoke’s Law. Apparatus:- 1- Glass tube 2- Steel balls of different sizes 3- stand and clamps 4- Weighing balance 5- Stopwatch, 6- Sample liquid (glycerin) 7- Rubber bands for marking calibration points 8- Ruler 9- Micrometer Viscosity Informally, viscosity is the quantity that describes a fluid's resistance to flow. Fluids resist the relative motion of immersed objects through them as well as to the motion of layers with differing velocities within them. Determine the viscosity coefficient using Stoke’s method The factors that affect the viscosity 1. Temperature: the temperature of the liquid fluid increases its viscosity decreases. In gases, its opposite, the viscosity of the gas fluids increases as the temperature of the gas increases. In liquids, as the temperature rises, the kinetic energy of the molecules increases and the intermolecular forces of attraction become weak, resulting in the subsequent decrease in the viscosity. 2. Molecular weight: the molecular weight of the liquid increases its viscosity increases. The viscosity is very much influenced by the shape, size, and chemical nature of the liquid molecules. The greater the size of the molecules and the higher the molar mass, the higher will be the viscosity because the greater will be the intermolecular interactions.  1- Set the experiment as in the figure. 2- Choose 5 spheres with different diameters. 3- Measurement of the diameter of falling balls using a micrometer. 4- Choose marked calibrated positions and ensure that the ball indeed falls with terminal velocity and then measure the distance (say 50 cm). 5- Drop a sphere centrally down the jar, and with the Procedure:- stopwatch finds the time it takes to traverse the distance that was determined before. 6- Watch the ball fall centrally through the liquid. When it reaches the first calibration mark, start the stopwatch and stop it when it reaches the second calibration mark. 7- Find the velocity of falling off the sphere by dividing the distance by the calculated time. 8- Repeat the above procedure for the 5 spheres of different diameters. 9- Applying the above equation, you can get the coefficient of viscosity.  Hemorheology - Blood viscosity is largely determined by the plasma viscosity and the hematocrit. The viscosity of blood Application of helps in the diagnosis of several diseases. For example, the viscosity in the plasma viscosity is higher in patients undergoing acute cardiovascular events such as stroke, MI, or sudden cardiac medical field death. Development of anemia, sickle cell disease, postmenopausal epidemiology, postmortem diagnosis can be studied. Thank you for your attention