What is the MSL pressure according to ICAO standard atmosphere?

The MSL pressure according to the International Civil Aviation Organization (ICAO) standard atmosphere is set at 29.92 inches of mercury. This value represents the average atmospheric pressure at sea level under standard conditions and is a reference point used by pilots and meteorologists.

In aviation, the standard atmospheric pressure is vital for calibrating altimeters, ensuring that pilots have an accurate altitude reading. The standard atmosphere is defined as having a sea level pressure of 1013.25 hPa (hectopascals), which corresponds to 29.92 inches of mercury. This standardization allows for consistency across flight operations and ensures that aircraft performance is predictable under standard conditions.

Other options, although they represent different atmospheric pressures, do not align with ICAO's defined standard for sea-level pressure, making them less relevant in this context. Understanding the significance of the 29.92 inches of mercury aids pilots in maintaining situational awareness and safety during flight operations.