EXPERIMENT # 6 VISCOSITY

Objective: To determine the viscosity of glycerin.

Theory: Viscosity is a measure of the resistance of a fluid which is being deformed by either shear stressor tensile stress.resistancefluidshear stresstensile stress In everyday terms (and for fluids only), viscosity is "thickness". Thus, water is "thin", having a lower viscosity, while honey is "thick", having a higher viscosity. Viscosity describes a fluid's internal resistance to flow and may be thought of as a measure of fluid friction.waterhoneyfriction

η = 2 r 2 ( ρ 2 – ρ 1 ) g. T s r --- R Where η = viscosity h = distance of fall = 80 Cm = 0.8m R = radius of the fluid cylinder = 0.022m t = time for fall = ______ sec r = radius of the ball = 0.002m ρ 2 = density of sphere = 7800 kg/m 3 ρ 1 = density of fluid = 1261 kg/m 3 g = acceleration due to gravity = 9.8 m/s 2

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Water

Tools: Steel ball Glycerin Holding magnet with clamp Stand base V shape Magnets Stop watch

Steps: 1.Drop the ball into the glycerin. 2.Start the stop watch as you drop the ball. 3.As soon as the ball has reached the bottom, stop the stop watch. 4.Read the time of fall t.

Data: Complete Table 1 Trials Time of fall (sec) Average Time = t =