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 tube, water rises several cm in the vertical tube and water just slightly edges forward in the barometer tube.
** Length of the air column in units of your measuring device: **
I used the smallest level of reduction because this lets me measure the slight movements with real numbers rather than tickmarks.
** 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. **
50cm
The air column was larger than my reduced ruler, so I marked the end and moved the ruler over to continue measuring.
** 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. **
0
50
20,21
20,21
20,21
20,21
20,21
** 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. **
0
50
20,21.75
20,21.75
20,21.75
20,21.75
20,21.75
** 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. **
0
50
20,22.5
20,22.5
20,22.5
20,22.5
20,22.5
** **
Your data look good.