What is defined as the altitude read by the altimeter when QNE is set?

When QNE is set on an altimeter, it represents the standard pressure setting of 1013.25 hPa or 29.92 inHg. Under these conditions, the altitude indicated by the altimeter is referred to as pressure altitude. This measurement is important because it allows pilots to compare the altitudes of different aircraft using a common reference point, regardless of local atmospheric pressure variations. Pressure altitude is essential for various flight operations, particularly when flying above the transition altitude, where aircraft typically operate under flight levels rather than actual altitudes. By using pressure altitude, pilots can ensure safe vertical separation from other aircraft in the airspace.