[EN 14511-1:2022, 3.55]:dry air at 20 °C and at standard barometric pressure of 101,325 kPa, having a density of 1,204 kg/m3.[EN 12792:2003, 340]:atmospheric air having a density of 1,2 kg m-3 at 20 C, 101 325 Pa (1013,25 mbar) and 65 % relative humidity.