What is the term for the barometric pressure used to adjust a pressure altimeter?

The term for the barometric pressure used to adjust a pressure altimeter is "Altimeter Setting." This term refers to the current atmospheric pressure adjusted to sea level, which pilots and air traffic controllers use to ensure that an aircraft's altitude readings are accurate. By setting the altimeter to the correct altimeter setting, pilots ensure that they are maintaining the proper altitude above sea level, which is crucial for safe navigation and separation from other aircraft.

The significance of having the correct altimeter setting becomes evident when considering the potential for altitude discrepancies if the altimeter were set incorrectly. Variations in atmospheric pressure can lead to deviations in altitude readings, which can be particularly critical when flying in mountainous regions or during an approach to an airport.

Understanding this term is essential for aviation safety and operational procedures. The importance of accurate pressure readings is underscored by the fact that it directly affects an aircraft's altitude estimation, thereby enhancing situational awareness in the cockpit and among air traffic controllers.