# T1 - Physics 7B WS T1(rev 2.0 Page 1 T-1 Ideal Gases The...

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Physics 7B WS T1 (rev. 2.0) Page 1 T-1. Ideal Gases: The Ideal Gas Law and Internal Energy Part 1: The Ideal Gas Law and the p-V Diagram Questions for discussion (Part 1) 1 . An ideal gas confined to a box exerts pressure on the walls of the box. Where does this pressure come from? (In other words, what is going on microscopically?) 2 . How could you measure the pressure of a gas? (“Use a pressure gauge” is not an answer, unless you also explain how a pressure gauge works. The same goes for barometers, etc.) 3 . If you cause an ideal gas to contract, does the temperature go up or down? Explain.

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Physics 7B WS T1 (rev. 2.0) Page 2 Problems (Part 1) You should complete your work for the “Problems” on separate sheets of paper. Do not work in the margins below; you’d like to be able to make sense of your work later when you review for the exams! 1 . A box of length 1 meter and cross-sectional area A has a moveable partition inside it. There is some gas on either side of the partition. The number of particles on the left is N 1 = 3 × 10 23 . The number of particles on the right is N 2 = 2 × 10 23 . The gas on both sides is in thermal equilibrium at the same temperature T. When the partition settles down to its final position, find the lengths L 1 and L 2 of the left and right sides of the box. 2 . Your baby brother is toddling around the house, playing with a toy balloon. You decide to teach him something about physics, so you take the balloon away from him and hide it in the freezer. (His cries are enough to convince you that he is excited about this learning experience.) When you put the balloon in the refrigerator, it will shrink. (Try it and see!) a) If the temperature inside your house is 25 ° Celsius, while the temperature inside the freezer is -10 ° Celsius, then by what percentage will the volume of the balloon change? We will take the pressure inside the balloon as constant. c)
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T1 - Physics 7B WS T1(rev 2.0 Page 1 T-1 Ideal Gases The...

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