InHg

InHg stands for Inches of Mercury and is a unit of measurement used in aviation to indicate atmospheric pressure. It is the measurement of the height of a column of mercury that can be supported by the air pressure at a given point. In aviation, altimeters are calibrated to display altitude based on the standard atmospheric pressure at sea level, which is 29.92 InHg. Pilots use InHg to set their altimeters to the correct pressure setting for their current altitude and location, which is important for accurate altitude readings and safe navigation.
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