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Viscosity Presentation By Team Eight

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Objective To determine how fluid a liquid really is by measuring its viscosity. To determine how fluid a liquid really is by measuring its viscosity. We will simply see how fast a sphere falls through a fluid. The faster the sphere falls, the lower the viscosity. The slower the sphere falls, the higher the viscosity. We will simply see how fast a sphere falls through a fluid. The faster the sphere falls, the lower the viscosity. The slower the sphere falls, the higher the viscosity.

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Material List / Price List Materials Materials Marbles (steel and glass) -$1.00 Marbles (steel and glass) -$1.00 Motor oil (10W-30) -$2.00 Motor oil (10W-30) -$2.00 Graduated cylinder -$5.00 Graduated cylinder -$5.00 Calculator-$15.00 Calculator-$15.00 Stopwatch -$4.00 Stopwatch -$4.00 Ruler -$1.00 Ruler -$1.00 Thermometer-$15.00 Thermometer-$15.00

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Method The measurement involves determining the velocity of the falling sphere. This is accomplished by dropping each sphere through a measured distance of fluid and measuring how long it takes to traverse the distance. Thus, you know distance and time, so you also know velocity, which is distance/time. The measurement involves determining the velocity of the falling sphere. This is accomplished by dropping each sphere through a measured distance of fluid and measuring how long it takes to traverse the distance. Thus, you know distance and time, so you also know velocity, which is distance/time. The formula for determining the viscosity is decorated with Greek letters and a squared term, but simply amounts to multiplying some numbers and then dividing by some others: The formula for determining the viscosity is decorated with Greek letters and a squared term, but simply amounts to multiplying some numbers and then dividing by some others: delta p = difference in density between the sphere and the liquid delta p = difference in density between the sphere and the liquid g = acceleration of gravity g = acceleration of gravity a = radius of sphere a = radius of sphere v = velocity = d/t = (distance sphere falls)/(time of it takes to fall) v = velocity = d/t = (distance sphere falls)/(time of it takes to fall)

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Fluid: WaterTemperature: °C Fluid: OilTemperature: °C Marble: SteelRadius: m Marble: SteelRadius: m Triald (m)t (s)v (m/s)h(Pa s) Triald (m)t (s)v (m/s)h(Pa s) Fluid: WaterTemperature: °C Fluid: OilTemperature: °C Marble: GlassRadius: m Marble: GlassRadius: m Triald (m)t (s)v (m/s)h(Pa s) Triald (m)t (s)v (m/s)h(Pa s) Type of Fluid Water Type of Fluid Oil Fluid density (p) Density of sphere (p) Density Contrast Radius of sphere (a) Gravity (g)9.8 m/s2 Gravity (g)9.8 m/s2 Fall distance (d) Data Entry

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Useful Tables g9.8 m/s 2 Density for water1000 kg/m 3 Steel marble density8430 kg/m 3 Glass marble density2850 kg/m 3 Density for 10W kg/m 3 Approximate Viscosities of Common Materials (At Room Temperature-70°F) * MaterialViscosity in Centipoise Water1 cps SAE 30 Motor Oil cps SAE 40 Motor Oil cps Castrol Oil1,000 cps Karo Syrup5,000 cps Honey10,000 cps Chocolate25,000 cps Ketchup50,000 cps Peanut Butter250,000 cps 100 Centipoise = 1 Poise 1 Centipoise = 1 mPa s (Millipascal Second) 1 Poise = 0.1 Pa s (Pascal Second)

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Setup Model

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Resources Interactive Model Cornell University Model

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