Atmospheric Pressure? A mercury barometer like that discussed in class (lecture

Question

Atmospheric Pressure?

A mercury barometer like that discussed in class (lecture 8) is used to measure atmospheric pressure The mercury column height is 716 cm. Unbeknownst to the engineer, air has leaked into the lop part of the barometer to that instead of zero pressure, the pressure there it 2 ,850 pascal. What is the (incorrect) atmospheric pressure reading in kPa, assuming that nobody knows about the leak? What is the actual (correct) atmospheric pressure in kPa? Calculate the percentage error due to the air that leaked into the

Explanation / Answer

a mercury barometer like that discussed in class is used to measure atmospheric pressure

i) Incorrect reading = height *density of mercury * g = 71.6*13534*9.81=9506227.5 Pa = 9506.23 kPa
ii)Actual pressure = 9506.23+2.850 = 9509.08 kPa

iii) Percentage error = (2.850*100/9509.08)=0.02997%

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