#$&*
PHY 202
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.
** your comment **
** How does the system behave and how does it 'feel'? **
As i squeeze the bottle, the air column decreases because of the water in the pressure tube. When I squeeze the bottle hard for a long time the shorter the air column gets until I cannot squeeze the bottle.
** Length of the air column in units of your measuring device: **
I am going to use one of the scale reduced rulers from the distortion paper ruler experiment. I think that this ruler will provide me with the most accurate results because if it were larger, the results might not be as accurate but if it were any smaller, I could not accurately read the ruler. It measures in cm.
** Your report of the vertical position of the first mark relative to the water surface of the first mark, the length of the air column in units of your selected measuring device, and the two meniscus positions observed with each of your five trials. **
27cm
I found this number by using two rulers, one measured all the way to 25 and the second I used for 2 additional cm. I added the two in order to reach 27cm.
** Your report of the vertical position of the second mark relative to the water surface of the first mark, the length of the air column in units of your selected measuring device, and the two meniscus positions observed with each of your five trials. **
19.0cm
17.5cm
12.0, 17.0
12.0, 17.2
12.0, 17.2
12.0, 17.8
12.0, 18.0
When I squeezed the bottle, the meniscus would rise. I found these measurements by using the meniscus mark to determine the relative change for each trial. The data seems to be accurate.
** Your report of the vertical position of the highest mark relative to the water surface of the first mark, the length of the air column in units of your selected measuring device, and the two meniscus positions observed with each of your five trials. **
21.0cm
17.5 cm
12.0, 19.0
12.0, 19.2
12.0, 19.6
12.0, 20.0
12.0, 20.0
I applied pressure in the same way as before. The pressure did not seems to have as great of an effect on the seocond mark as it did on the first. This data was not as accurate as the data before since it was not as easy to accurately sqeeze to the 2nd mark.
** Your report of the vertical position of the 'in-between' mark relative to the water surface of the first mark, the length of the air column in units of your selected measuring device, and the two meniscus positions observed with each of your five trials. **
35.0cm
17.5 cm
12.0, 25.4
12.0, 25.8
12.0, 26.1
12.0, 25.9
12.0, 26.4
the meniscus rises as the bottle is squeezed. The increase is lowered once again.
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1 hour
I think your observations are OK. We'll see how you interpret them on Part II.
The length of the air column should have changed by something in the general neighborhood of 5% or so between atmospheric pressure and the highest pressure.