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Problem 7. A U-shaped manometer uses mercury. On the left side gas A is connected with...

Problem 7. A U-shaped manometer uses mercury. On the left side gas A is connected with a pressure of 39 cm Hg. On the right side, gas B is connected with a pressure of 1/3 Patm. If the mercury level is 14 cm higher on the right side than on the left side, determine the atmospheric pressure, Patm. Express your answer in units cm Hg.

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Answer #1

Pressure of gas A on the left side = PA = 39 cmHg

Pressure of gas B on right side = PB = (1/3)Patm

Height difference in the U-manometer = H = 14 cm

The manometer uses mercury as it's liquid therefore,

Pressure difference between the left side and the right side = P = 14 cmHg

Patm = 75 cmHg

Atmospheric pressure = Patm = 75 cmHg

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