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 **
2/23/10 2 pm
** How does the system behave and how does it 'feel'? **
I really hope i have this set up correctly. When i squeeze the bottle, the water rises up the vertical tube fairly quickly, and it also moves up the pressure tube very slightly.
** Length of the air column in units of your measuring device: **
I am using an actual scale. I am a machinist and i do not trust paper rulers(it's in my blood!)
I can respect that. You certainly know about tolerances, errors, and measurement, and you have nothing to gain from using paper rulers (which, however, are plenty accurate for these experiments).
** 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. **
38 cm, i have my own metric scale.
This measurement came from the capped end to the end of the air column, or to the solid water. There are a couple of drops of water trapped in there.
** 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. **
10 cm
38 cm
0, .5cm
0, .4cm
0, .5cm
0, .5cm
0, .4cm
These are the results from the first trial, which i was squeezing the bottle until the water in the vertical tube reached 10cm. It averaged going about .5 cm in the pressure tube for each 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. **
20 cm
38 cm
0, .9cm
0, 1cm
0, 1cm
0, .9cm
0, 1cm
These are the results from the second trial, which i was squeezing the bottle until the water in the vertical tube reached 20cm. It averaged going about 1 cm in the pressure tube for each 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. **
70 cm
38 cm
0, 2.1cm
0, 2cm
0, 2.2cm
0, 2cm
0, 2.1cm
These are the results from the third trial, which i was squeezing the bottle until the water in the vertical tube reached 70cm. It averaged going about 2.1 cm in the pressure tube for each squeeze.
** **
40 cm
38 cm
0, 1.4cm
0, 1.4cm
0, 1.3cm
0, 1.3cm
0, 1.3cm
These are the results from the fourth trial, which i was squeezing the bottle until the water in the vertical tube reached 40cm. It averaged going about 1.3 cm in the pressure tube for each squeeze.
** **
2 hours, trying to set it up correctly!
&#This looks good. Let me know if you have any questions. &#