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PHY 232
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.
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RESUBMISSION
I am resubmitting this lab because after checking your feedback I feel I did not measure what you were expecting.. This should be much easier to repeat this simple lab compared with struggling to figure out what I have misjudged when I don't have the right data for the next lab (which can be very frustrating).
I had to do it in two sittings last time because my experiment was moved while I was out of the house it probably did not work out anyway.
I have re-read the lab 3/4 times and I changed my markings so that I would start exactly at 10 cm; but I think were I went wrong was the meniscus measuring.
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Water moves up the vertical tube; yet also, air moves away in the pressure tube. While getting a feel for this I believe these changes were increasing at a decreasing rate. (In other words it got harder to change the more I squeezed - possibly just due to my setup though) the reduction of volume increases pressure causing these changes.
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I am not sure the level of reduction with the ruler that I used from the lab kit - I may be using the larger one provided last semester. (It is not one of the smallest ones but may be reduced somewhat)
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39.3 cm
I measured from the edge of the ‘stopper’ at the end of the tube to where the water began.
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10
39.3
20.5, 19.4
20.5, 19.5
20.5, 19.4
20.5, 19.3
20.5, 19.4
In the data given above we measure: the distance to marking #1, L of the air column, and the two meniscus measurements. All data given in cm.
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20
39.3
20.5, 18.8
20.5, 18.7
20.5, 18.8
20.5, 18.7
20.5, 18.7
In the data given above we measure: the distance to marking #2, L of the air column, and the two meniscus measurements. All data given in cm.
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30
39.3
20.5, 18.6
20.5, 18.5
20.5, 18.6
20.5, 18.5
20.5, 18.5
In the data given above we measure: the distance to marking #1, L of the air column, and the two meniscus measurements. All data given in cm.
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45 minutes - Already knew the setup - just changed the markings and how I was measuring the meniscus. Please let me know if this data looks somewhat correct before I move on to part 2.
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The data look good. The percent changes in the tube length appear appropriate to the heights of the water column.
The level of reduction could affect your final results in the next part, but simply multiplying the final result you will obtain there by the reduction ratio will correct everything, so you can proceed.
In the meantime cut a strip of paper or something to a 10 cm length as indicated on the ruler you used, put it in your pocket and next time you find yourself near a ruler (inches or cm, doesn't matter) measure it. We'll be able to easily figure out the level of reduction from that measurement.
If you had to read the instructions 3 or 4 times, then the instructions need to be modified. Don't take a lot of time with it, but any brief suggestions are welcome (optional on your part, but welcome on this end).
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