A 0.01 inch of mercury change in the altimeter setting results in how many feet change in pressure altitude?

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Multiple Choice

A 0.01 inch of mercury change in the altimeter setting results in how many feet change in pressure altitude?

Explanation:
Pressure altitude changes nearly linearly with the altimeter setting, and the standard rule is about 1000 feet per 1 inHg change. So a 0.01 inHg change in the altimeter setting corresponds to 0.01 × 1000 = 10 feet of change in pressure altitude. This is an approximate rule, but it’s the quick mental math used for small adjustments.

Pressure altitude changes nearly linearly with the altimeter setting, and the standard rule is about 1000 feet per 1 inHg change. So a 0.01 inHg change in the altimeter setting corresponds to 0.01 × 1000 = 10 feet of change in pressure altitude. This is an approximate rule, but it’s the quick mental math used for small adjustments.

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