What is the standard pressure at sea level?

The standard atmospheric pressure at sea level is defined as 29.92 inches of mercury (Hg). This value is recognized by various aviation and meteorological organizations around the world as the average pressure exerted by the atmosphere at sea level under normal conditions. When pilots set altimeters, they often use this value to calibrate their instruments to ensure accurate altitude readings.

The significance of this specific measurement is crucial for flight safety and navigation. An accurate altimeter setting helps in maintaining correct altitude, especially when flying in controlled airspace or during landing and takeoff scenarios where precise altitude is critical.

Understanding this standard helps in interpreting weather reports and influences how flight plans are created, as any variations from the standard pressure can impact true altitude readings in flight.