548_Physics ProblemsTechnical Physics

548_Physics ProblemsTechnical Physics - 550 Temperature...

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550 Temperature Q19.10 Call the process isobaric cooling or isobaric contraction. The rubber wall is easy to stretch. The air inside is nearly at atmospheric pressure originally and stays at atmospheric pressure as the wall moves in, just maintaining equality of pressure outside and inside. The air is nearly an ideal gas to start with, but PV nRT = soon fails. Volume will drop by a larger factor than temperature as the water vapor liquefies and then freezes, as the carbon dioxide turns to snow, as the argon turns to slush, and as the oxygen liquefies. From the outside, you see contraction to a small fraction of the original volume. Q19.11 Cylinder A must be at lower pressure. If the gas is thin, it will be at one-third the absolute pressure of B. Q19.12 At high temperature and pressure, the steam inside exerts large forces on the pot and cover. Strong latches hold them together, but they would explode apart if you tried to open the hot cooker. Q19.13
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