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physics

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During a transatlantic flight, you drink a bottle of water and tightly close its lid again. Back on the ground during taxiing to the terminal, you notice that the thin plastic bottle is crushed, and you eyeball it to be only about 70 percent of its original volume (the photo shows the actual bottle). If the pressure on the ground is about 108 kPa, what was the cabin pressure up in the air? The cabin temperature stayed a comfortable 20 degrees Celsius at all times. Approximate air as an ideal gas.

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