A U-shaped tube is connected to a box at one end and open to the air at the othe

Question

A U-shaped tube is connected to a box at one end and open to the air at the other end. The box is full of gas at pressure pgas, and the tube is filled with mercury of density 1.36×10^4 kg/m3. When the liquid in the tube reaches static equilibrium, the mercury column is h1= 13.0 high in the left arm and h2= 6.00 high in the right arm, as shown in the figure. What is the gas pressure pgas, inside the box? Give in units of Pa.

A U-shaped tube is connected to a box at one end and open to the air at the other end. The box is full of gas at pressure pgas, and the tube is filled with mercury of density 1.3610^4 kg/m3. When the liquid in the tube reaches static equilibrium, the mercury column is h1= 13.0 high in the left arm and h2= 6.00 high in the right arm, as shown in the figure. What is the gas pressure pgas, inside the box? Give in units of Pa. I^'m stuck on what equation to use. I did 1 atm + rhogh and got an answer of 110629.6 Pa, but it isn^'t correct.

Explanation / Answer

we have that Pgas+pgh=P Pgas=P-pgh=1atm-pgh

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