A change of .15 inch of mercury pressure is equal to _____ feet?

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Test your knowledge of pitot-static systems for aviation exams. Study with multiple-choice questions and detailed explanations. Prepare effectively for success on your exam!

Multiple Choice

A change of .15 inch of mercury pressure is equal to _____ feet?

Explanation:
In aviation, the change in static pressure is translated into a change in altitude using the standard pressure lapse rate, which is about 1 inch of mercury per 1,000 feet near sea level. So a small pressure change scales with altitude in roughly the same way: 0.15 inHg is 0.15 × 1,000 ft, which equals about 150 feet. That’s why a pressure change of 0.15 inHg corresponds to roughly 150 feet. The other options would require pressure changes of 0.075 inHg, 0.3 inHg, or 1 inHg, respectively.

In aviation, the change in static pressure is translated into a change in altitude using the standard pressure lapse rate, which is about 1 inch of mercury per 1,000 feet near sea level. So a small pressure change scales with altitude in roughly the same way: 0.15 inHg is 0.15 × 1,000 ft, which equals about 150 feet. That’s why a pressure change of 0.15 inHg corresponds to roughly 150 feet. The other options would require pressure changes of 0.075 inHg, 0.3 inHg, or 1 inHg, respectively.

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