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course PHY 232
3/14 12:32 pm I forgot that I hadn't finished submitting the rest of the Bottle 3 series.
Brief Bottle Experiment 3b Set up one bottle with water in it, the vertical tube extending down into the water. The pressure tube should be set up as before. The vertical tube should extend upward at least a meter. A convenient way to raise the tube is to put the second cap loosely on another bottle about half full of water, which can then be set on a shelf (just be careful to keep that end of the vertical tube out of water, and that cap loose so the upper end of the tube remains at atmospheric pressure).
Seal the cap in the lower bottle so you can squeeze water into the vertical tube. Give the tube a squeeze of about 2 on your 1-10 'squeeze scale', and do whatever is necessary to get the data required to find the change in the vertical level of the water in the vertical tube, and accompanying percent change in the length of the air column.
Repeat for squeezes of 5 and 8 on your 'squeeze scale'.
Report what you measured, how you measured it and what your measurements were.
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I measured the water level and air column length using a meter stick. I was able to hold the pressure with one hand and measure with the other while doing so.
Init:
17 cm, 22.5 cm
Squeeze, WL, ACL
2, 28, 21.3
5, 56, 21
8, 115, 18.5
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Give 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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Init:
17, 22.5, 100000 Pa
28, 94.7%, 102700
56, 93.3%, 105500
115, 82.2%, 111300
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Based on your table, how many Pascals of pressure change should correspond to a 1% change in the length of the air column?
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There's a little inconsistency in my results since the change btw each of the squeezes isn't linear. It goes from as low as 500 Pa/% to over 800 but I did get a anomalous value of 2000 for the 25-56 change but that's probably due to some error in my measurements.
@& A straight line fit to your data would give you something in the general vicinity of 700 Pa per percent change.*@
&#This lab submittion looks good. See my notes. Let me know if you have any questions.
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