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course Phy 242
January 28 around 12pm.
Brief Bottle Experiment 1dRaising water
Add the extension to the tube, so that by squeezing you can force water from the bottle into the tube. Squeeze hard enough to raise the water to as high as possible into the tube. Evaluate how hard you had to squeeze, on the 1-10 scale you used in part 1b. Measure how far you were able to raise water in the tube above the level of the water in the bottle.
How high did you raise the water, and how hard did you have to squeeze (using the 1-10 scale)?
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4, it only took a slight squeeze to raise the water to the extension piece.
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Give the bottle a squeeze corresponding to 1 on the 1-10 scale, and observe how high water rises. Then give it another squeeze, halfway between 1 and the squeeze you used to raise water to the top of the tube. Do this blind. Don't look at the tube, just feel the squeeze. Then look at the tube and see where the water is.
Report a table of water column height vs. squeeze.
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Squeeze: 1, 3
Water column height: 1 cm, 7 cm
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@& Good.
How much change do you think these squeezes would change the length of the air column, based on observations in earlier experiments?
How much extra pressure did each water column height require?
Based on these observations, if you didn't already know what the atmospheric pressure was, what would you conclude is the atmospheric pressure in N / m^2?*@