Home > DocumentationLes mètres cubes "anormaux", qu'est-ce que c'est ?

Les mètres cubes "anormaux", qu'est-ce que c'est ?

NORMAL ou PAS ?

mètres cubes "anormaux - PARTENAIRDans notre jargon quotidien il est souvent fait mention de débits en normaux mètres cubes ! Y aurait-il des mètres cubes “anormaux” ?

En fait le mètre cube normal, noté Nm3, comme toute unité standard, répond à des critères précis. Il est mesuré au niveau de la mer, à pression atmosphérique standard de 1013 Hpa et à 0°C.

La norme ISO 1217 fait par contre, référence à des mètres cubes d’air libres à 20°C, 1 atm. et est utilisée par les compressoristes.

Comment s’y retrouver ? Et surtout comment comparer ?

Le rapport au zéro absolu nous donne la solution : 0°C = 273°K 20°C = 293°K

1 Nm3 est donc égal à 293 soit environ: 1,073 m3 selon ISO 1217

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