A J-shaped tube is filled with air at 760 Torr and 22 °C. The long arm is closed off at the top and is 100.0 cm long; the short arm is 40.00 cm high. Mercury is poured through a funnel into the open end. When the mercury spills over the top of the short arm, what is the pressure on the trapped air? Let h be the length of mercury in the long arm.
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A J-shaped tube is filled with air at 760 Torr and 22 °C. The long arm is closed off at the top and is 100.0 cm long; the short arm is 40.00 cm high. Mercury is poured through a funnel into the open end. When the mercury spills over the top of the short arm, what is the pressure on the trapped air? Let h be the length of mercury in the long arm.
I need further explanation of one step:
- when P2 is obtained in the short arm, the equation is 40-h+P1
1. How did we get this equation?
2. the short arm does not contain any air, why do we create an equation of P2 in the short arm?
Please clarify these concerns.
I have received the answer shown in the attached picture but it is not correct.
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