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course Phy 232
2/5 1650Starting with the cap in place on an empty bottle, siphon water from an adjacent full bottle. Allow the siphon to run a few minutes until the water levels in the two bottles stabilize.
Estimate the percent change in the volume of the air in the capped bottle.
40%
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Estimate the percent change in the number of molecules in the air within the capped bottle.
0%
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Estimate the percent change in the volume of the water in the open bottle.
40%
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What do you think is the percent change in the air pressure in the capped bottle?
The air pressure nearly double since the volume of air got reduced to nearly half of the original volume.
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What is the difference in the two fluid levels?
equal
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What is the percent change in the number of air molecules in the capped bottle?
0%
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Raise the open bottle as high as possible without disturbing the capped bottle. Allow time for the water levels in the two bottles to stabilize.
What percent of the volume of the capped bottle do you now estimate is occupied by water?
60%
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Estimate the percent change in the number of molecules in the air within the capped bottle.
0%
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By what percent do you estimate the pressure in the capped bottle exceeds the original pressure (i.e., the pressure when the bottle was first capped)?
over twice the original air pressure
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What percent of the uncapped bottle do you estimate is now occupied by air?
80%
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What is the difference in the two water levels?
7.5cm
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Return the uncapped bottle to the tabletop. What happens?
The bottles would have returned to equilibrium if I had not lost suction in the air.
What is now the difference in the two water levels?
They would have been the same (if I hadn't lost suction).
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What do you think is the pressure in the uncapped bottle as a percent of its original pressure (before the bottle was capped)?
The pressure in the uncapped bottle would not change. It is atmospheric pressure.
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&#Good work on this lab exercise. Let me know if you have questions. &#