What is the pressure of standard atmospheric pressure in inches of mercury?

Standard atmospheric pressure is defined as the pressure exerted by the weight of the atmosphere at sea level. It is commonly represented as 29.92 inches of mercury (inHg), which is derived from historical barometric measurements. This measurement is important for aviation, meteorology, and various scientific applications, as it serves as a reference point for other pressure readings.

The value of 29.92 inches of mercury corresponds to an equivalent pressure of 1013.25 millibars or 101.325 kilopascals. This standard is not only relevant for understanding atmospheric phenomena but also plays a crucial role in flight operations, where pilots use altimeters calibrated to this standard pressure to determine altitude. Adjustments must be made when atmospheric pressure deviates from this standard, affecting aircraft performance and safety.

In the context of the other options, it is essential to note that they represent pressures that deviate from the accepted value of standard atmospheric pressure. Understanding this correct reference point helps ensure accurate measurements and safer operations in air travel and related fields.