What is the standard sea level pressure?

The standard sea level pressure is established as 29.92 inches of mercury. This value is used as a reference point in meteorology and aviation, primarily for the purpose of standardizing altimeter settings. At this pressure, the atmosphere is considered to be stable at sea level, allowing for consistent calculations regarding altitude and weather predictions.

The significance of this standard is that it provides a baseline for measuring atmospheric pressure, which varies with altitude and weather conditions. When pilots and meteorologists report altimeter settings, they use this standard to ensure that measurements are comparable across different locations and conditions.

Other values listed in the choices are close but do not represent the universally accepted standard. The variations result from different atmospheric conditions or regional settings, but 29.92 inches of mercury is the established figure used globally for reference.