Units of mg/Nm3 for gas concentrations

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SUMMARY

The discussion centers on the use of the units mg/Nm3 for gas concentrations, emphasizing the importance of specifying "Normal" cubic meters. This specification is crucial because the volume of gas varies with pressure and temperature, necessitating a reference to standard conditions. Engineers involved in pneumatic system design are particularly aware of this requirement, as they consistently refer to volume rates under normal conditions.

PREREQUISITES
  • Understanding of gas laws and behavior under varying pressure and temperature.
  • Familiarity with standard conditions in gas measurement.
  • Knowledge of pneumatic system design principles.
  • Basic concepts of units of measurement in environmental science.
NEXT STEPS
  • Research the definition and significance of standard conditions in gas measurements.
  • Explore the implications of gas volume changes with pressure and temperature variations.
  • Learn about the design considerations for pneumatic systems and their reliance on normal conditions.
  • Investigate the differences between mg/m3 and mg/Nm3 in environmental regulations and reporting.
USEFUL FOR

Engineers, environmental scientists, and professionals involved in gas measurement and pneumatic system design will benefit from this discussion.

Billy_w
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Hi all,

Sometimes I come across the units of mg/Nm3 for gas concentrations. What I would like to ask is why we need to specify that we are talking about mg per Normal cubic meter? Why not just mg per cubic meter? Whatś that Normal for?

Thanks in advance.

Billy_w
 
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Billy_w said:
Hi all,

Sometimes I come across the units of mg/Nm3 for gas concentrations. What I would like to ask is why we need to specify that we are talking about mg per Normal cubic meter? Why not just mg per cubic meter? Whatś that Normal for?

Thanks in advance.

Billy_w

The volume occupied by a gas is a function of the pressure and temperature. So that, you have to refer it to a standard conditions (i.e. atmospheric or normal conditions).

EDIT: Those engineers that have designed pneumatic systems know that very well, because volume rates of air are always referred to these normal conditions.
 
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