measuring atmospheric pressure

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'? **

When I squeeze the bottle, water rises up the vertical tube, and the column of water in the pressure tube moves away from the bottle, so that the system is reacting to my added force. It feels like a small squeeze will enable the measuring of the experiment to proceed.

** Length of the air column in units of your measuring device: **

I used the reduction where 2 cm on the device equals 1 real cm, because I am dealing with a small length so it fits the length of tube, and it is more clearly legible than the 1:4 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. **

58.10 cm

I taped 2 measuring devices together, so that the 40-cm mark of the first length corresponded with the 0-cm mark of the second length. The meniscus measured at 20.20 cm, and the end of the air column measured at 78.30 cm, for a length of 58.10 cm.

** 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. **

19.00

20.20

20.20, 21.10

20.15, 21.15

20.15, 21.15

20.15, 21.10

20.10, 21.15

To raise the water in the vertical tube by 19.00 cm, I had to squeeze the bottle so that the measurement in the pressure-measuring tube increased by an average of about 0.98 cm. This was determined by squeezing the bottle so that the water in the vertical tube reached about 10.00 cm above the cap, and measuring the meniscus in the pressure-measuring tube before and after the squeeze.

** 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. **

29.00

20.15

20.15, 21.60

20.15, 21.60

20.10, 21.60

20.15, 21.60

20.15, 21.60

To raise the water in the vertical tube by 29.00 cm, I had to squeeze the bottle so that the measurement in the pressure-measuring tube increased by an average of about 1.46 cm. This was determined by squeezing the bottle so that the water in the vertical tube reached about 20.00 cm above the cap, and measuring the meniscus in the pressure-measuring tube before and after the squeeze.

** 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. **

49.00

20.10

20.10, 22.60

20.15, 22.65

20.15, 22.60

20.15, 22.65

20.15, 22.60

To raise the water in the vertical tube by 49.00 cm, I had to squeeze the bottle so that the measurement in the pressure-measuring tube increased by an average of about 2.48 cm. This was determined by squeezing the bottle so that the water in the vertical tube reached about 40.00 cm above the cap, and measuring the meniscus in the pressure-measuring tube before and after the squeeze.

** **

39.00

20.20

20.20, 22.10

20.15, 21.90

20.15, 22.00

20.15, 22.00

20.20, 22.10

To raise the water in the vertical tube by 39.00 cm, I had to squeeze the bottle so that the measurement in the pressure-measuring tube increased by an average of about 1.85 cm. This was determined by squeezing the bottle so that the water in the vertical tube reached about 30.00 cm above the cap, and measuring the meniscus in the pressure-measuring tube before and after the squeeze.

** **

It took about an hour to take all the measurements and complete the write-up.

&#Very good responses. Let me know if you have questions. &#