Phys223-Labatorial07-Ideal-Gas-Law-WI2018.pdf - Phys 223...

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Phys 223, Labatorial 7, Winter 2018 University of Calgary Department of Physics and Astronomy PHYS 223, Winter 2018 Labatorial 7: Ideal Gas Law Goals: To improve your understanding of the ideal gas law (particularly the relation between pressure and temper- ature), and of absolute zero and temperature scales. Overview: In this labatorial, you will explore the ideal gas law conceptually, and apply it to the constant volume gas apparatus and perform an experiment to determine the temperature of absolute zero on the Celsius scale. Preparation: Randall D. Knight, Physics for Scientists and Engineers, Third Edition, Pearson/Addison-Wesley: Sections 16.3 and 16.5 Equipment: Constant volume gas apparatus, beaker with water, cork, hot plate, Vernier temperature probe and holder, laboratory stand, meter stick, clamps, stiring rod, computer with Logger Pro analysis software and the file “Ideal Gas Law.cmbl”. Note to students: The data collection for this labatorial takes quite a while. Your TA will tell you how to collect data while working through the labatorial worksheet. A different group of students will be asked to do each measurement, so the class as a whole will generate the complete data set that you will use. The experimental procedure is described on pages 5 and 8 of this worksheet, and the table for entering the data is on page 8. 1
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Phys 223, Labatorial 7, Winter 2018 The Ideal Gas Law and Absolute Zero The ideal gas law states how all the variables that characterize an ideal gas are related 1 : pV = Nk B T, (1) Question 1 : Explain what each of the letters in the ideal gas law represents, state whether it is a variable or a constant and what are its units. p = V = N = k B = T = Question 2 : When you use the ideal gas law as written in Eq. (1) in a calculation, does it matter if the temperature is in Celsius or in Kelvin? If it does matter, explain why. V T(K) Question 3 : The relationships between the variables in the ideal gas law are easier to understand if we consider special cases. For the first case, consider a situation in which the pressure p is fixed. Sketch the corresponding graph that shows how volume and temperature (in K) are related. This is termed isobaric.
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