What is the standard pressure at sea level according to ISA?

The standard pressure at sea level according to the International Standard Atmosphere (ISA) is defined as 29.92 inches of mercury (inHg), which is equivalent to 1013.2 hPa (hectopascals). This value is used as a reference point in various aviation and meteorological calculations, making it a fundamental parameter for pilots and meteorologists.

The significance of this standard pressure lies in its role in calibrating altimeters, predicting weather patterns, and ensuring consistency in atmospheric studies. When pilots use altimeters, they rely on this standard pressure to measure altitude accurately, which is crucial for safety during flight.

Understanding that this is the baseline allows practitioners to make informed calculations regarding pressure changes, weather forecasting, and altitude acknowledgment. This is foundational knowledge for those involved in aviation and meteorology, highlighting the importance of the ISA standards.