For every 1,000ft climbed, how much does mercury drop, approximately?

When considering the relationship between altitude and atmospheric pressure, for every 1,000 feet of altitude gained, the pressure typically decreases by approximately 1 inch of mercury (inHg). This decrease is a standard approximation used in meteorology and aviation to help pilots understand changes in atmospheric conditions with altitude.

This concept is based on the barometric formula and the behavior of the atmosphere, which indicates that as you ascend, the weight of the air above you decreases, leading to lower atmospheric pressure. This information is crucial for pilots as it affects aircraft performance and the altimeter readings.

In practical terms, knowing that pressure drops 1 inch of mercury for every 1,000 feet helps pilots make necessary adjustments in their flight plans and operations, ensuring safe navigation through varying atmospheric conditions.