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DETERMINATION OF LIQUID VISCOSITY COEFFICIENT
Task 1. Determination of time of balls falling down 1.1. Take 5 balls. 1.2. Measure diameter of each ball ài by means a number of peaches of microscope ÌÏÂ-2. Repeat measurements 3 times. Calculate average values ai ave of the ball diameter. Enter the obtained results into table 1. Table 1
1.3. Calculate average value of ball radius ri ave for each ball according to the formula: where n = 3 is amount of measurements. Enter the results into table 1. 1.4. Measure the distance between the upper and the lower scores l of the cylinder by a ruler. Enter the results into table 1. 1.5. Take the first ball with known radius 1.6. Measure the liquid temperature by a thermometer. Enter the results into table 2. 1.7. Enter values of material density r the balls made of and liquid density rl into table 2. 1.8. Calculate the internal friction coefficient for each ball according to the formula:
Enter the results into table 1. Table 2
Task 2. Calculation of viscosity measurement error Calculate average value of the viscosity according to the formula: where n = 5 is amount of measurements. Enter the results into table 3. 2.2. Calculate deviation from average value Δηi according to the formula: Table 3
2.3. Calculate root-mean-square error of the arithmetic mean 2.4. Determine the viscosity measurement absolute error according to the formula: Dh = tSt where the Student’s coefficient is tSt = 2,78 (n = 5 and a = 0,95) 2.5. Calculate the viscosity measurement fractional error according to the formula: 2.6. Write down the result in a form: Conclusions The data of laboratory work fulfillment Pass mark Signature Mark of laboratory work defending Signature questions to be admitted for doing laboratory work and its defending 1. Name the transport phenomena. What quantity is transferred during each of them? 2. Explain the cause of internal friction. 3. Explain the cause of heat conductivity. 4. Explain the cause of diffusion. 5. Write and explain Newton’s law for a steady laminar stream. 6. How does the coefficient of internal friction depend on temperature? 7. What is physical sense of velocity gradient? 8. Describe the Stock’s method for the coefficient of internal friction determination. 9. What forces make the ball move in liquid? 10. Deduce the formula for calculation of the coefficient in our experiment. LABORATORY WORK Date: 2015-01-12; view: 1483
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