How is barometric pressure measured and displayed in aviation?

Barometric pressure in aviation is measured and displayed in inches of mercury, which is a standard unit used to indicate atmospheric pressure. This measurement is crucial for determining altitude, as altimeters rely on the barometric pressure to provide accurate readings of an aircraft's elevation above sea level.

The altimeter is calibrated to reference the standard pressure of 29.92 inches of mercury at sea level. As an aircraft climbs or descends, the altimeter detects changes in atmospheric pressure and translates those changes into altitude readings. A decrease in pressure indicates an increase in altitude, while an increase in pressure corresponds to a descent.

The use of inches of mercury is universally understood within aviation, making it essential for pilots to interpret altitude accurately during flight operations. Understanding this concept is essential for navigating and ensuring safety while flying.