What is the value of standard atmospheric pressure at sea level?

Standard atmospheric pressure at sea level is defined as 29.92 inches of mercury (Hg). This value is a key reference point in aviation and meteorology, as it is used to calibrate altimeters and is the baseline for determining altitudes in flight. It represents the pressure exerted by the Earth's atmosphere at sea level under standard conditions.

This specific measurement of pressure is universally accepted and serves as a critical standard in flight operations, ensuring that pilots can interpret altimeter readings accurately regardless of local variations in atmospheric pressure due to weather changes. Thus, knowing the standard pressure helps pilots maintain situational awareness and make informed decisions regarding altitude and flight operations.