Mercury is poured into the opening end of a j-shaped glass, Ask an Expert

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Mercury is poured into the opening end of a J-shaped glass tube which is closed at the short end, trapping air in that end. Assume ideal gas behavior. The short arm has a length of 50cm and the long open arm has a length of 10 cm. What is the length of the trapped air column in the short arm when the long arm is filled with mercury. Neglect the curvature of the closed end.

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