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The basic barometer can be used as an altitude– measuring
Chapter 3, Problem 122P(choose chapter or problem)
Problem 122P
The basic barometer can be used as an altitude– measuring device in airplanes. The ground control reports a barometric reading of 753 mmHg while the pilot’s reading is 690 mmHg. Estimate the altitude of the plane from ground level if the average air density is 1.20 kg/m3.
Questions & Answers
QUESTION:
Problem 122P
The basic barometer can be used as an altitude– measuring device in airplanes. The ground control reports a barometric reading of 753 mmHg while the pilot’s reading is 690 mmHg. Estimate the altitude of the plane from ground level if the average air density is 1.20 kg/m3.
ANSWER:
Solution 122P
We need to calculate the altitude of the plane from the ground level. The pressure difference between the ground control and the pilot’s position can be calculated from the data given.
Step 1
The difference in mercury level reading
Now, the pressure difference due to this much difference in mercury level reading is