PV constant Equation 4 and P i V i P f V f Equation 5 where is the ratio of

Pv constant equation 4 and p i v i p f v f equation 5

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PV ! = constant Equation 4 and P i V i ! = P f V f ! Equation 5 where ! is the ratio of constant pressure specific C P heat to constant volume specific heat C v , i.e., ! = C P C v . See section 21.2. Procedure: Part 1- Ideal gas laws and Balloons - Estimation of temperature of liquid nitrogen and absolute zero 1. You will have a total of four liquid nitrogen setups. The balloons will be filled with either air or nitrogen. You will observe and record the behavior of the balloons. 2. If the length (height) of a balloon filled with nitrogen gas is measured before it is put into liquid nitrogen and the length is measured after some sufficient time one can estimate both the temperature of liquid nitrogen and absolute zero. See questions 2 and 3. Part 2- Adiabatic processes 2. Unscrew the blue cap of fire syringe (or fire piston) and gently measure the outside diameter of the o-rings on the piston. Record this value. Figure 1- Fire syringe 3. Next, use 10 cm as the height of the inside of the cylinder (the part that the piston goes into). This is your initial height.
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4. Making sure your hands are dry tear off a small piece of cotton and gently place (slide) it to the bottom of the cylinder using a coffee stirrer. Be careful not to compress it too much. Screw blue cap back on. 5. Using a rapid motion compress the piston handle downward and observe what you see. You will probably have to make more than one compression- one quickly after another. What do you observe? 6. You will need to estimate how far down you were able to compress the cylinder in order to determine your final height. See question 5. Part 3- Isothermal compression 7. Using the fire syringe and masses you will now plot mass vs. height (this is essentially the same as pressure vs. volume since the cylinder is uniform.) 8. Use the ruler stuck to the side of the cylinder to measure height. See figure 2 below. Add 200 g to mass to account for the mass of the piston and friction. Plot mass vs. height and curve fit. Part 4- Ideal gas Law 9. In the front of the lab is a container of compressed gas with approximately 100 psig (i.e., pounds per square inch gauge ). You will measure its weight and then leak the air out. You will then measure its weight again to determine the weight of air that was in the tank initially. 10. While the tank is leaking someone will point a remote temperature gauge at the tank to see if the temperature of the tank changes while the tank is leaking. Questions 1. What did you observe about the behavior of the balloon filled with air compared to the balloon filled with nitrogen. What did you observe about the balloon filled with nitrogen at a higher pressure (and the one you squeezed) compared to the the one at the lower pressure. How do you account fo for the difference?
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