# CU-Boulder ATOC 1070 - Lab2 (2 pages)

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## Lab2

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## Lab2

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Atoc 1070 - Weather and the Atmosphere Laboratory
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Sarah Rose ATOC 1070 Lab 2 Temperature and Pressure of Air Lab 2 Part I Measuring the Density of Air Question 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 2 a 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 equipment b Inability to create a perfect vacuum in the bottle Lab 2 Part II Determining the Relationship between Pressure and Temperature Question 3 a 3 3 4 32 10 32 b Experimental value of R was 560 2 J KgK which is greater then the actual value of R 287J KgK by 560 2 J KgK 287 J KgK 237 3J KgK c 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 4 a 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 We had 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 the instructor 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

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