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Viscosity Lab I. II. III. IV. V. Problem: How does the concentration (thickness) of a liquid relate to viscosity? Background Information: From Glencoe Science laboratory handout the following information was determined: Viscosity is the resistance of a fluid to flow. Fluids are liquids and gases. A viscous fluid has a high viscosity: that is, it does not flow easily. A less viscous fluid flows easily. Viscosity is a physical property of a fluid. In this lab dish soap, corn oil, and waters’ viscosity will be determined and ranked from high to low viscosity. With this information in mind…….. What is known about dish soap?___________________________. What is known about corn oil?_____________________________. What is known about water?_______________________________. Hypothesis: If ______________________________________ THEN________________________________________________. Procedures: 1. In this lab a BB will be dropped through baby oil, corn oil and rubbing alcohol. Here’s how: 1. seal ONE end of a straw with masking tape. 2. place the sealed end of the straw into the clay. 3. place the straw in clay into a beaker. It should stand away from the side of the beaker. (straight up) 4. Take a pipet and fill the straw with baby oil. Make sure NO air is in the straw. Baby oil ONLY. 5. One lab partner will be the timer, one the observer of the BB falling through the fluid, and the other partner the BB dropper. 6. Record the entire time it took for the BB to fall through the fluid filled straw. Record this data in the Data Table below. 7. REPEAT these steps using new straws/tape for the corn oil and rubbing alcohol. 8. All data will be placed in the Data Table. 9. Determine the viscosity rank of the three tested fluids. This means place in order from highest to lowest viscosity of the fluids. 10. Make a graph showing the results. (graph paper is given after the Data table.) Let’s practice making and interrupting graphs!!!! Data Table; Fluid tested TIME in seconds Baby Oil Corn Oil Rubbing Alcohol Observations of the fluids Baby Oil Corn Oil Rubbing Alcohol VI. Conclusion questions: 1. How is the time needed for a BB to fall through a fluid related to the fluid’s viscosity? 2. What happens to the viscosity of a fluid when it’s thickness increases? 3. What happens to the viscosity of a fluid when its thickness decreases? V. Conclusion Statement: This lab has proven that The facts that prove this statement are