5. Exploring Pressure with PhET

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Evergreen Valley College *

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Mechanical Engineering

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Jan 9, 2024

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Exploring Pressure Name: William Bui Objectives Determine the relationship between pressure and depth. Determine the relationship between pressure and density. Determine the density of an unknown fluid. Directions 1. Go to the PhET simulation “Under Pressure” https://phet.colorado.edu/en/simulation/under-pressure 2. Push the big Play arrow. Start with the default settings. In addition, fill the tank with water and select “Ruler”, like the diagram to the right. 3. Click on the pressure gauge to move it toward the water. Measure the pressure in the water at every 0.50 m from the surface to the bottom. Record your results on the table below. Note that the simulation will give you kPa. Convert to Pa before entering the values on the table. 4. Use Excel, or similar, to make a graph of pressure vs depth. Do a linear best fit and include the equation on the graph . Copy and paste your graph and equation below. a. What is the physical meaning of the slope? The meaning of this slope is that for every meter, the pressure increases by 9926 Pascals b. What is the physical meaning of the y-intercept? The meaning of the y-intercept is the pressure at 0 depth 5. Now, pick a depth and vary the fluid density from 700 to 1,400 kg/m 3 . Record your results on the table below. Note that the simulation will give you kPa. Convert to Pa before entering the values on the table
Chosen Depth: 1 meter 6. Use Excel, or similar, to make a graph of pressure vs density. Do a linear best fit and include the equation on the graph . Copy and paste your graph and equation below a. What is the physical meaning of the slope? The meaning of the slope is that for every kg/m3, the pressure increases by 10.4 b. What is the physical meaning of the y-intercept? The meaning of the y-intercept is the pressure with a density of 0 7. How would your two graphs differ if you gathered data from Mars? Jupiter? Explain why. Try to come up with the answer before testing it. The graphs for mars would be less overall and the graphs for Jupiter would be more overall because fluid density depends on the acceleration of the liquid. 8. Click on the icon with the question mark on the sink to access the mystery fluid portion. Determine the density of a mystery fluid. If your last name starts with A-H, test Fluid A. If your last name starts with I-N, test Fluid B. If your last name starts with O-Z, test Fluid C. Describe your method and results below. 118233 = 10.4(p) + 101324 p = 1625.86 kg/m3 In order to calculate the result, I used the equation that I had gotten in the pressure vs density graph and using the same depth, I plugged in the numbers and calculated for density. 9. Based on what you learned in this activity, what is the formula for determining the pressure in a fluid? State what each of the symbols mean. The formula for determining pressure in a fluid is pressure = density * gravity * height. Pfluid = p * g * h
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