phy202
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 **
I have had trouble understanding the set up for this lab. After reading this lab many times trying to understand what I am doing, I am at the point of just doing the lab whether right or wrong or whether I get any info close or not. I know that is the wrong attitude to take but that is what happens when frustration sets in.
Rodger
** How does the system behave and how does it 'feel'? **
When I squeeze the bottle the fluid rises in the vertical tube and the fluid moves to the end of the vertical tube. I will say that both meniscus move in that direction meaning the column of water moves in that direction. My best explanation is the same difference when I use a U-tube manometer to set gas pressures on gas burners at work but in these situations the U-tube manometer has graduation marks in inches of water column from which I can determine my differentiate pressures.
** Length of the air column in units of your measuring device: **
I have decided to use two 300mm scales for measurements purposes. I'm using these because I feel more comfortable using actual measurements rather than using the reduced paper ones.
** 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. **
17cm
I'm not sure exactly what you mean other than measuring from the capped end to the meniscus. Maybe I'm sure what the meniscus is think that it is the water level next to the ending slug of air
** 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. **
21cm
17cm
17cm, 16.8cm
17cm, 16.8cm
17cm, 16.8cm
17cm, 16.8cm
17cm, 16.8cm
This info means that the pressure increased in the pressure tube by the moving of the meniscus toward the end of the tube. Trying to take great pains to be repetitive on attaining the 21cm level in the vertical tube, I marked the move from the first meniscus to the second meniscus so I could visually see the point then I measured the move from the pressure capped end.
** 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. **
31cm
17cm
17cm, 16.6cm
17cm, 16.6cm
17cm, 16.6cm
17cm, 16.6cm
17cm, 16.6cm
This info means that the pressure increased in the pressure tube by the moving of the meniscus toward the end of the tube. The meniscus moved just slightly more for the extra height in the vertical tube.
** 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. **
41cm
17cm
17cm, 16.4cm
17cm, 16.4cm
17cm, 16.4cm
17cm, 16.4cm
17cm, 16.4cm
This info means that the pressure increased in the pressure tube by the moving of the meniscus toward the end of the tube. The meniscus moved just slightly more for the extra height in the vertical tube.
** **
Didn't do a fourth trial
** **
After the set up the lab didn't take quite as long as I imagined. Counting up the confusion time understanding the set up over several days, probably 3 hrs.
&#Your work looks very good. Let me know if you have any questions. &#