Just to add for completeness, for ICAO/the rest of the world: Transition altitude (ascent) and transition level (descent) is typically defined per FIR (flight

Just to add for completeness, for ICAO/the rest of the world: Transition altitude (ascent) and transition level (descent) is typically defined per FIR (flight information region), but can be airport-dependent. It is listed in the relevant airport charts. 7000 is fairly common, but it varies. Altimeter setting is measured in hPa/millibars (with the standard being 1013.25, which corresponds to 29.92 inHg).