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 apply force to the bottle, water rises in the vertical and the air column in in presuure tube gets shorter. The more force I apply the shorter the column becomes and the more water rises in my vertical tube. It feels pretty natural, although I notice that it requires a decent amount of force to get the system to work, but that may just be related to my strength.
** Length of the air column in units of your measuring device: **
I am having a hard time printing out the paper rulers on my computer. I am going to use the tape measure that I have. It has centimeter markings so I will be able to make pretty precise measurments although relative measurements are the most important.
** 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. **
17.5
cm
I put the tube on my ruler and took the measurement at one end which was 4 cm and subtracted that from the meaurement on the other end which was 21.5 cm which gave me my intial measurement of 17.5 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. **
15 cm
17.5 tape measure markings in cm.
17.5, 17.1
17.5, 17.0
17.5, 17.1
17.5, 17.1
17.5, 17.1
I noticed that with this first trial my meniscus did move very much at all from it's initial position. I was difficult to make accurate measurements because it actually didn't move enough to make a really noticeable difference in most cases. I am taking my measurments by taking two markings on my tape measure from the beginning of the meniscus to the barrier and subtracting the two.
** 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. **
25
17.0 cm, using a tape measure
17.0,16.7
17.0, 16.7
17.0, 16.5
17.0, 16.6
17.0, 16.5
With this trial, the meniscus a litte more of a distance with each squeeze. Once squeezed the bottle and took my measurement and stopped squeezing, the meniscus settled back into it's initial position or very close to it. I am taking my measurments by taking two markings on my tape measure from the beginning of the meniscus to the barrier and subtracting the two.
** 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. **
35 cm
17.0, using a tape measure
17.0, 16.0
17.0, 16.1
17.0, 16.3
17.0, 16.1
17.0, 16.2
This trial was interesting. I would assume that in this trial my meniscus would move even further from its starting position than it did in the second trial, but that was not the case. I assumed this because it felt like I was applying more force on the same amount of area, and thus more pressure(according to P=F/A) I thought more work would have been done on the meniscus. I repeated the trial a few times trying to get as accurate results as possible. Each time I applied the force, I would measure my meniscus with the tape measure before I released the pressure.
** **
My two liter bottle is distorting quite a bit, so it's very difficult to raise the water above my third marking.
You appear to have very good data, which will serve you well in Part 2 of this experiment.