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course Phy 202
11/15 11
Brief Bottle Experiment 1cSiphoning water into empty sealed bottle
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Starting 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.
****About 25%
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Estimate the percent change in the number of molecules in the air within the capped bottle.
****0% because none of the molecules have escaped
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Estimate the percent change in the volume of the water in the open bottle.
****I would estimate about 35%
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What do you think is the percent change in the air pressure in the capped bottle?
****I would assume that because there was a 25% change in volume, there is also a 25% change in pressure
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What is the difference in the two fluid levels?
****5cm
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What is the percent change in the number of air molecules in the capped bottle?
****0% because no air has entered or left the bottle.
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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?
****Approximately 25%
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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)?
****the pressure would increase by 25% because the volume of air decreased by 25%
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What percent of the uncapped bottle do you estimate is now occupied by air?
****60%
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What is the difference in the two water levels?
****10cm
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Return the uncapped bottle to the tabletop. What happens?
What is now the difference in the two water levels?
****The water equalized between the two bottles and there is no difference in the two water levels.
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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)?
****I am not sure about the pressure as a percent of the original, but the pressure is low in the uncapped bottle, and the pressure increased once the bottle was capped.
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&#Very good data and responses. Let me know if you have questions. &#