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CU-Boulder ATOC 1070 - Lab2

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Sarah RoseATOC 1070Lab 2: Temperature and Pressure of Air Lab 2, Part IMeasuring the Density of AirQuestion 1(0.953 kg/m^3 - 0 .996 kg/m^3) / 0.996 kg/m^3 x 100 =-4.3 /0.996 = |-4.32|= 4.32%Question 2a. Is your actual percent error greater or less then 5%? a. Less then 5% > 4.32%b. If your actual error is less then the expected error, what could have caused these errors? a. Flaws in the measuring equipmentb. Inability to create a perfect vacuum in the bottle Lab 2, Part IIDetermining the Relationship between Pressure and Temperature Question 3a. 3% + 3% + 4.32% = 10.32%b. Experimental value of R was 560.2 J/KgK, which is g reater then the actual value of R 287J/KgK by: 560.2 J/KgK – 287 J/KgK = 237.3J/KgKc. The actual percent error for R is on the spreadsheet was 95.2%a. This value is greater than the expected percent error 10.32% < 95.2%d. In accuracy in lab measuring equipment Question 4a. If you increase temperature, then the density decreases.b. If you increase/decrease density, then pressure increase/decrease. This means that density is directly proportional to pressure Summary and Conclusion Part 1 of this lab was fairly straight forward I measured the weight of the bottle with air and Tara recorded it and then I help the pump in place and twisted shut the bottle while Tara hit the on/off button for the pump. Some error could have occurred here when I was trying to close the valve on the bottle some air could have gotten in. We then measured the bottle again with out air. In part 2 of the lab most of the equipment was already set up from pervious lab classes but we went though all the wired connections and changed out the water. Wehad to start the lab over at one point because the meter was measuring in millivolts instead of volts. Our numbers were very off compared to the other groups and theinstructor Holly said that depending on what setoff lab equipment we used pretty much determined the accuracy of this lab. Regardless of the condition of the lab equipment it’s almost impossible to get perfect reading from the meter because you have to do one reading at a time. By the time we recorded the pressure reading and switched the switch to temperature we weren’t taking the reading at that exact pressure. Also the thermometers were analog so it was at our digression when we though it was exactly at the 25, 35 or 45 degree. i. Sources for error in this lab came from inaccurate equipment measurements also the inability for the pump to get all the molecules out of the bottle. ii. Poor measurements from the equipment make the percent error much greater and our results came out to be way off from the actual true value of Riii. This lab demonstrated the relationship between temperature pressure and density, we concluded that temperature and density are inversely proportional where density and pressure are directly proportional. I’m not sure if this lab directly helps me understand the atmosphere because it’s hard for someone to observe pressure or density without any tools butit did help me understand the relationship between the variables of the ideal gas lab better. The air is most dense at 7am because it is the coolest temperature. The lower the temperature = density increases. The air is least dense at 3pm because the temperature is the highest. High temperature = density


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CU-Boulder ATOC 1070 - Lab2

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