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course PHY 232
3/14 3:20 pm
Brief Bottle Experiment 3c
Repeat experiment 3 b, with one modification: Instead of squeezing the bottle to raise water, you will heat it up, using hot tap water.
Heat the system gradually, by first turning on the water so that is just trickles down one side of the container. Adjust the flow so that the water in the vertical tube rises just above the bottlecap. Take measurements to determine the vertical position in the tube, and the change in the length of the air column in the pressure tube compared to its original length.
Increase the flow of hot water so that the level in the vertical tube increases by another 10 cm or so, and repeat your measurements.
Repeat this process for two more steps.
Report your data in the usual manner, with at least a brief explanation, and include a table of the heights to which water was raised vs. the length of the air column as a percent of its original length. Add a third column which gives the pressure resulting from each squeeze, as indicated by the height of the water in the vertical tube (that pressure should be given in Pascals).
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PV=nRT
T increases meaning that T2 > T1 --> T2/T1 > 1 --> P2 > P1
Also, I don't think I mentioned this in 3b but the same thing happens there but opposite in that a volume decrease creates the pressure increase and: V1 > V2 --> V1/V2 > 1 --> P2 > P1
Init:
WL, ACL
17.6 cm, 22.5 cm, 100000 Pa
19.4, 99%, 1900
33.4, 98%, 3270
50.4, 95%, 4940
63.9, 93%, 6262
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Now set the vertical tube to allow water to run out so that it could be collected at the vertical level of your last measurement, and turn the tap on full. You won't need to measure the collected water, but watch the pressure tube as the water flows out and report what you observe.
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Seems the pressure tube doesn't change anymore and I think that has to do with the fact that P is now constant since the water isn't moving vertically but T is still increasing and so V must change and that accounts for the water flowing out without P, and thus the air column length, changing.
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Sketch a pressure vs. volume graph for the process you observed (that is, the pressure of the gas in the bottle vs. the volume of the gas in the bottle). You may use reasonable estimates for the volumes.
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For the first part the graph is linear going from 100,000 to 106262 and then the volume increases by about 10% while P is constant. So 1/2 of a square.
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&#Your work on this lab exercise looks very good. Let me know if you have any questions. &#