Problem 10.24 An open-end manometer containing mercury is connected to a contain
ID: 549930 • Letter: P
Question
Problem 10.24
An open-end manometer containing mercury is connected to a container of gas, as depicted in Sample Exercise 10.2 in the textbook. What is the pressure of the enclosed gas in torr in each of the following situations?
A)
he mercury in the arm attached to the gas is 15.6 cm higher than in the one open to the atmosphere; atmospheric pressure is 0.965 atm .
Express your answer using three significant figures.
B)
The mercury in the arm attached to the gas is 12 mm lower than in the one open to the atmosphere; atmospheric pressure is 0.97 atm .
Express your answer using two significant figures.
Explanation / Answer
As we know that 1atm=760 torr=760 mm Hg=76 cm Hg
Q1
in this case the pressure equation will be (if we consider p in terms of mercury height)
Pi+h=0.965*76 (Just balancing the pressure at a common point which is at the same level
Like balancing the pressure at the gray dotted line.
Hence Pi=0.965*76-15.6=57.74cm of Hg
Q2
Similar to above case balancing pressure at same level
Pi=0.97*760+12=749.2 mm of Hg
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