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PHY 122
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 **
9/26 7pm
** How does the system behave and how does it 'feel'? **
The more pressure you put on the bottle the water level raises in the vertical tube and the water in the pressure tube begins to move into the horizontal region of the tube. The more pressure you put on the bottle the higher the vertical tube water level raises and the further the water in the pressure tube proceeds closer to the end of the pressure tube.
** Length of the air column in units of your measuring device: **
The one reduces by a little more than 3 times. This ruler should give me the best resolution. Although it will be a little more difficult to read the error I get should be less than with any of the other level of reduction.
** 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. **
234.4 units
Ruler measured from 0.6 to 42.4 units. I taped the part of the tube down with the air pocket in it in order to help ensure a more accurate measurement. The I used the ruler to measure the length by marking the tube at each measurement with a sharpie then continuing the measuring process. The measurement took 5 rulers plus 26 units. (42.4-0.6)*5+(26-0.6)=234.4 units.
** 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. **
20
234.4
18.1,9.5
18.0,9.1
18.1,11.2
17.9,11.4
This information tells us that for a 20cm rise in water for a 234.4 unit air section there will be an average change of 7.52 units.
17.6,10.9
** 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. **
30
234.4
17.3,6.9
18.1,5.9
18.0,6.1
17.5,7.0
17.1,6.4
This information tells us that for a 30cm rise in water for a 234.4 unit air section there will be an average change of 11.14 units.
** 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. **
40
234.4
35.3,10.2
36.1,10.5
36.2,10.6
36.5,10.6
36.4,10.9
This information tells us that for a 120cm rise in water for a 234.4 unit air section there will be an average change of 25.56 units.
** **
80
234.4
36.4,14.4
36.5,14.5
36.0,15.4
35.9,15.4
35.5,14.9
This information tells us that for a 30cm rise in water for a 234.4 unit air section there will be an average change of 21.06 units.
** **
2.5 hours
I believe you have good data, and you should get good results in the Part II experiment to follow.