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'? **
First, the water rises in the vertical tube; then, as it ascends, the water in the pressure tube begins to move. This doesn't take much effort.
** Length of the air column in units of your measuring device: **
I came back hom efor a couple of days from Blacksburg and didn't bring my reduced rulers with me; because of this, I have to simply use a regular ruler. Sorry!
** 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. **
32.8 cm
I had to use the lenght of my ruler twice (I marked the position at the end of it with a pen) and replaced it again, adding the numbers of centimeters from the second reading to those from the first.
** 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
32.8 cm
35.7 cm, 36.9 cm (this is starting from the non-capped side of the pressure tube)--I assume the air column, on the other hand, is measured from the end of the capped tube to where the water starts moving toward the left.
33.8 cm, 35.7 cm, 36.8 cm
33.7 cm, 35.6 cm, 36.8 cm
33.8 cm, 35.6 cm, 36.7 cm
33.8 cm, 35.7 cm, 36.7 cm
It seemed as though the water, when I let the pressure off, generally returned to its original position. When I forced the water through the tube to the first 10 cm mark, it caused the water in the pressure tube to move forward about a centimeter each time, give or take a bit.
** 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. **
33.7 cm, 35.7 cm, 37.3 cm
33.7 cm, 35.5 cm, 37.3 cm
33.8 cm, 35.6 cm, 37.4 cm
33.8 cm, 35.7 cm, 37.3 cm
There might be a slight discrepancy in my measurements because I am having a hard time holding the water level in the vertical tube steady enough while I mark the water level in the pressure tube. The results should be quite accurate, but that could be considered a contribution to any experimental error.
** 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. **
10 cm
33.5 cm, 36.2 cm, 38.0 cm
33.5 cm, 36.2 cm, 37.2 cm
33.5 cm, 36.2 cm, 37.5 cm
33.6 cm, 36.2 cm, 37.7 cm
33.5 cm, 36.3 cm, 37.7 cm
I was able, each time, to raise the water in the vertical tube to the 40 centimeter mark.
** **
10 cm
33.7 cm, 36.3 cm, 37.4 cm
33.7 cm, 36.4 cm, 37.5 cm
33.8 cm, 36.3 cm, 37.5 cm
33.8 cm, 36.3 cm, 37.4 cm
33.7 cm, 36.3 cm, 37.4 cm
Your responses have been reviewed and your data appears to be OK.