#$&*
Phy 202
Your 'question form' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** **
You will use the remainder of the thin tube supplied with your kit to make the pressure-indicating tube:
First fill the new tube with water:
The easiest way to do this is to temporarily disconnect the vertical tube and replace it with the new tube, so that when you squeeze the container you can fill the new tube. Add water to the container until it is nearly full, then fit the stopper into the hole.
Hold the open end of the pressure-indicating tube a little higher than the top of the container, near the point where you just connected it, and squeeze the bottle so that water fills the tube. Since the water level in the container is higher than in the preceding experiment, and since the end of the new tube isn't much higher than the water level, this shouldn't require a very hard squeeze.
When the tube is full, maintain the squeeze so the water doesn't return to the container and disconnect it. You will have a tube full of water.
Now empty about half the water in the tube, cap it and connect it to the system, and replace the vertical tube:
Just raise one end and/or lower the other, and water will flow out.
Place a terminating cap on one end of this tube.
Open a second tube in the stopper by removing the terminating caps at both of its ends.
Using a connector, connect the pressure-measuring tube to newly opened tube coming out of the stopper.
Replace the vertical tube.
Fit the stopper back into the hole in the container.
You should at this point have:
The vertical tube, extended down into the water and out of the top of the container
The extended pressure-measuring tube, open on one end (through its connection to the newly opened tube in the stopper) to the air inside the container, half full of water, and capped at the other end.
A third tube through the stopper, still capped.
** **
Relative to the lab (measuring atmospheric pressure, part 1), I'm having an issue with the set-up. My lab kit includes the tubes as mentioned; however, I do not have one that is of different diameter. They all seem to be equal, and I would just ask for additional information with actually arranging the pressure-indicating tube. This has been the main reason for my delay in submitting this lab, as well as the (Bottle Thermometer). I apologize for the burden of requesting additional insight, but I want to make sure I'm on track in performing the instruction. So, just to reiterate, how could I get this up and running with the same diameter tubing? Could I fabricate something on my own, and if so, how can I determine length of smaller diameter tubing? As always, thank you so much!
@& The diameter of the tubing doesn't make a significant difference, so this will be no problem.
The pressure tube is just a tube with some water in it, with air on either side; the tube is closed at the end. The water is called the 'water plug'. When you squeeze the tube the excess pressure on one side of the water plug forces it toward the end of the tube, which compresses the 'air column' between the water plug and the end of the tube. This compression continues until the pressure in the 'air column' of the pressure tube is equal to that in the bottle.*@
@& Let me know if this doesn't help.*@