What are the standard altimeter settings at sea level?

The standard altimeter setting at sea level is 29.92 inches of mercury. This value represents the standard atmospheric pressure at sea level according to international aviation standards. The use of this specific setting ensures that altimeters calibrated to this standard will provide consistent altitude readings across different aircraft and airspace, thereby promoting safety in aviation.

Altimeters rely on atmospheric pressure to determine altitude, and since pressure can vary with weather conditions, the 29.92 inches of mercury standard provides a reference point that pilots and air traffic control can use universally. When flying, pilots adjust their altimeters to the local altimeter setting, which can change due to weather systems. However, for understanding standard conditions, 29.92 inches is the reference used in aviation regulations and training.