1. Go to https://phet.colorado.edu/en/simulation/under-pressure . Drag a pressure gauge so that it points to a spot just above the grass. What is the pressure here? How many atmospheres is this?

2. Now fill up the well by pulling out on the top faucet handle. Check the ruler box, and use the ruler to measure the depth of the water. Use the equation that relates pressure and depth to calculate the expected value for the pressure at the bottom of the well.

3. Now drag another pressure gauge to the bottom of the well. Compare this pressure measurement to your calculation.

4. Go to the second scenario of the four shown at the lower left of the screen. Fill up the well with water. Drag a pressure gauge around all parts of the well, watching how the reading changes. Does the pressure depend on the shape of the container, the depth, or both?

5. Go to the third of the four scenarios. Place a pressure gauge near the bottom. Drop 250 kg on the surface of the water. By how much does the pressure reading change? Add another 250 kg, then add 500 kg, each time recording thechange in pressure. Is the change in pressure proportional to the weight added?

6. Now remove the weights and move the pressure gauge to a place in the water near the large open surface. How do the pressure changes at this location compare to the previous step when the same weights are added? Whoseprinciple reflects this effect?

7. Go to the fourth scenario, and use the relationship between pressure and depth to solve for the density of fluid A, fluid B and fluid C.

8. If the uncertainty in these density values is 5% or less, can you identify anypossibilities for what these three liquids might be?