Approximately how many feet of altitude correspond to a 1 inch of mercury change?

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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

Approximately how many feet of altitude correspond to a 1 inch of mercury change?

Explanation:
In aviation, altitude is inferred from ambient pressure measured by the altimeter. In the standard atmosphere near the surface, pressure falls about 1 inch of mercury for each 1,000 feet you climb. So a change of 1 inHg corresponds to roughly 1,000 feet of altitude. That’s why 1,000 feet is the best approximate answer. The relationship is a handy rule of thumb for quick estimates, though it becomes less exact at higher altitudes or with temperature variations.

In aviation, altitude is inferred from ambient pressure measured by the altimeter. In the standard atmosphere near the surface, pressure falls about 1 inch of mercury for each 1,000 feet you climb. So a change of 1 inHg corresponds to roughly 1,000 feet of altitude. That’s why 1,000 feet is the best approximate answer. The relationship is a handy rule of thumb for quick estimates, though it becomes less exact at higher altitudes or with temperature variations.

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