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Phy 242
Your 'measuring atmospheric pressure' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** Measuring Atmospheric Pressure_labelMessages **
** Measuring Atmospheric Pressure_labelMessages **
As I squeeze the bottle, water goes into the vertical tube, and the air column in the pressure tube gets smaller or non-existent. It seems that my pressure I exert on the bottle has more of an effect on the pressure tube than the vertical tube. The air column moves more in the pressure tube than the water does in the vertical tube.
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I am using a ruler where one of its 'centimeters' is 2/3 of an actual centimeter. I chose this because it will be more accurate because it's a smaller scale. If I go any smaller, I would have to tape two of the printed rulers together and I think this would create more room for inaccuracy.
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23.5
I obtained this result by using the the reduced ruler & measuring the length using the middle of the ruler (the two ends are a little cut off). The longer end of the ruler read 26.5 and the shorter end read 3, so I subtracted 3 from 26.5 to get 23.5.
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11
22
15, 15.5
15.1, 15.6
15.3, 15.9
15.2, 15.7
15.1, 15.6
It seems that when I exert the same amount of pressure to the bottle, the air column changes length by a consistent amount.
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21
22.2
15.1, 24.2
15.3, 24
15.3, 24.1
15.2, 24.1
15.3, 24.2
Again, it seems that when I bring the water in a vertical tube up to the same length, the position of the meniscus is changing consistently. Since I was trying to get the water to raise higher in the vertical tube, which means I was exerting more pressure on the bottle, the meniscus moved by a greater amount.
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31
22.1
15.4, 35.7
15.3, 35.6
15.5, 35.5
15.5, 35.8
16.6, 35.9
Again, since the pressure applied to the bottle is going to the vertical tube and the pressure tube, this pressure is staying pretty consistent since I am raising the water in the vertical tube to the same height. Therefore, the change in the position of the meniscus is pretty consistent.
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1.5 hours
&#Your work on this lab exercise looks good. Let me know if you have any questions. &#