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Barometer Lab

Barometer Lab. María José Guerrero8B. Problem: When and how is the straw going to move during this days for testing? Variables: Independent: days Dependent: air pressure Controlled : the room for testing (my room)

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Barometer Lab

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  1. BarometerLab María José Guerrero8B

  2. Problem: When and how is the straw going to move during this days for testing? Variables: Independent: days Dependent: air pressure Controlled : the room for testing (my room) Hypothesis: If the straw of the barometer gets up or down then the air pressure would change because the walls of the container would flex in and out when the air pressure changes making the straw move and show different pressure.

  3. Air pressurehandoutanswers! 1. A 2. B 3. A 4. A 5. 10% 6. Consist of atoms and molecules. Air has mass and has density and pressure. 7. Air pressure molecules push in any direction 8. Inches of mercury and millibars 9. c 10. f 11. g 12. d 13. a 14. e 15. b

  4. Data Collection

  5. Data Analysis Change of air pressure measured twice a day during 7 days Air pressure Days

  6. GraphQuestions/Answers From the graph, what can you conclude about changes in air pressure? I can conclude about change in the air pressure that in my house air pressure stays around the same and that there is a low temperature because of the cold climates. How many data points were you able to collect? Do you think this is enough data to make conclusions about air pressure and weather changes? I was able to collect 14 data points. I think that it is enough data because air pressure shows changes during a few days and air pressure is not going to lower or higher that much in more days. Why was it important to record observations about the weather conditions? It was important to record observations of weather conditions because then we could analyze the temperature changing and at the same time what is the air pressure. Also weather conditions do not change in a very noticeable way.

  7. Graph Questions/Answers Was your data reliable? Explain why or why not. My data is reliable because I tested over seven days, twice a day at the same time each day. I record the pressure accurate and did a barometer that does work because the straw show movement. Was your data accurate? Explain why or why not. Maybe my data is not so accurate but it is near to the accurate measurement. Its because the straw hole was in the middle of two point so I approximate to the nearest pressure. What change in atmospheric conditions must occur to cause the free end of the straw to rise? What change must occur for it to fall? The change in the atmospheric condition that must occur for the free end of the straw to rise is the water vapor. The change that must occur for the straw to fall is too much air pressure for the straw to sustain in the container.

  8. Graph Questions/Answers According to your observations, what kind of weather is usually associated with high air pressure? With low air pressure? The weather that is associated to high air pressure is between 19-20 degrees. With low pressure is 19 degrees C. If your balloon had a tiny hole in it, what would happen to the accuracy of your barometer? The accuracy of the barometer would change because then the air is going to get out of the jar and I would not have a precise measure of the air pressure What effect, if any, would a great temperature change have on the accuracy of your barometer? Explain. Maybe if there was a great temperature change my barometer would have an error and would not be so accurate because it is not common for the air pressure to change drastically. My barometer would maybe be broken.

  9. ConcludingParagraph In the lab of the barometer we tested the air pressure during seven days twice a day and recorded all the data needed. My hypothesis was supported by my results because the temperature changed when the straw went high or low as not so much the air pressure. My results mean that there wasn’t a big change in the temperature and that it stayed around the same when the air pressure changed. Also the days of testing were cold meaning a low temperature and that there wasn’t too much vapor. The sources of error that I had were not recording my weather predictions and the actual weather during the days of testing. And the other source of error was not stretching the balloon in the top of the glass as much as it can, making it not so accurate. The lab could be re-designed for reducing error by making clear at first what we need to measure like the actual temperature and by making all the barometers stay in only one place like the class for having mostly the same results. My lab wasn’t so hard, it was easy and I did my best thinking and recording the data.

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