What is the standard pressure in inches of mercury (Hg)?

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The standard pressure is defined as 29.92 inches of mercury (Hg), which is equivalent to 1013.25 millibars or 101.325 kilopascals. This value is critical in various aviation and meteorological calculations, as it serves as a baseline for calibrating altimeters and understanding atmospheric conditions.

The standard atmospheric pressure, often utilized by pilots and meteorologists, establishes a reference for sea level. When reported on weather charts, it provides a consistent measurement framework for comparing pressure systems. Understanding this standard helps in interpreting weather patterns, forecasting, and flight planning, as deviations from this standard can significantly impact aircraft performance and safety.

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