1.the pressure exerted by the earth's atmosphere at any given point. 2.a value of standard or normal atmospheric pressure, equivalent to the pressure exerted by a column of mercury 29.92 in. (760 mm) high, or 1013 millibars (101.3 kilopascals). Also calledbarometric pressure. ...
same pressure of 1013 millibars (average atmospheric pressure) for 2 standards: DIN 1343 : temperature 273.15K (0°C) ISO 2533 : temperature 288.15K (15°C) For calculations of head loss, the size of volumes of gas (compressed or not) moved into the ducts must be given in cubic meters...