What is the standard pressure at sea level?

The standard pressure at sea level is defined as 29.92 inches of mercury (inHg). This value is based on the standard atmosphere model, which provides a reference for various atmospheric conditions at sea level. The measurement of atmospheric pressure in inches of mercury is a common practice in aviation and meteorology, as it translates well into altimeter settings and helps pilots understand the prevailing weather conditions.

29.92 inHg is crucial for accurate navigation and operation of an aircraft, as it is used to calibrate altimeters. An altimeter set to this standard pressure allows pilots to determine their altitude relative to the mean sea level. When the atmospheric pressure varies from this standard value, adjustments must be made to the altimeter to ensure accurate altitude readings are maintained.

Understanding and using this standard pressure allows pilots to ensure safety and maintain proper altitude during flight.