What is the standard altimeter setting in inches of mercury?

The standard altimeter setting is 29.92 inches of mercury. This value is recognized and utilized in aviation as the standard atmospheric pressure at sea level, which is essential for calibrating altimeters in aircraft. A correctly set altimeter ensures accurate altitude readings, which are crucial for safe flight operations, particularly during ascent, descent, and landing.

In aviation, altimeters are calibrated to this standard setting so that all aircraft operate on a common reference, ensuring uniformity in altitude reporting across different aircraft. This standardization is vital for maintaining safe distances between aircraft, especially when flying in proximity to each other and when navigating through controlled airspace. The use of 29.92 inches of mercury is a key element in following proper aviation procedures.