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Pressure Beneath the Surface of a Fluid: Measuring the Correct Depth
Equipment used in this experiment: pressure sensor and interface with computer, flexible tube, glass tube, and graduated cylinder with water. The open end of the glass tube is resting on the bottom of the cylinder.
A plot of pressure vs depth for the first attempt and the second attempt. (The values are very close to 1, indicating that the trendline is a good fit.)
The water level in the glass tube is actually above the lower end of the tube. In the left picture the end is at the 400-mL mark, whereas the water level is higher between the 400-mL and the 500-mL marks. In the right picture the end of the tube is resting on the bottom of the cylinder, with the water level significantly higher near the 100-mL mark.
Depth and pressure values as the glass tube is lowered into the graduated cylinder. The pressure readings for the first attempt are measured with the lower end of the tube aligned with the marks on the cylinder, whereas the pressure values for the second attempt are measured with the observed water level in the tube aligned with the marks. The depth values are measured to each mark from the surface of the water.
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