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 **
** How does the system behave and how does it 'feel'? **
I have the pressure-indicating tube with a 19-cm air column
that decreases when I squeeze the bottle. It doesn't take much of a squeeze to accomplish this. he water rises into the vertical tube.
** Length of the air column in units of your measuring device: **
I am using a standard ruler that measures inches on on
side and cm on the other. These cm can be best rounded to 0.1 of a 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. **
19 cm
I measured from the capped end to the meniscus of the water in the pressure-indicating tube with my standard ruler, which measured 19cm..
** 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. **
10cm
19cm
17.6, 17.2
17.5, 17.2
17.5, 17.1
17.5, 17.3
17.5, 17.2
The pressure from the bottle that makes the water rise results in an increase in pressurein the pressure-indicating tube which causes the water level of the water column to rise (in my system set-up) which in thrun decreases the air column.
** 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. **
20cm
19cm
17.5, 17.0
17.5, 17.1
17.5, 17.1
17.5, 17.1
17.5, 17.0
again, as the pressure is increasing inside the bottle, it is increasing inside the tube. the column rises a little more in the pressure-indicating tube because a more 'intense squeeze' is needed to raise the water in the vertical tube 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. **
30cm
19cm
17.5, 16.8
17.4, 16.7
17.4, 16.8
17.4, 16.8
17.4, 16.7
The water has reached the 3rd mark, which is increasing the pressure in the pressure-indicating tube, and yet still, it continues to raise the meniscus, shortening the air column.
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1 hour (including set-up)
&#Very good work. Let me know if you have questions. &#