Pressure rise in a vaccum system gas specific?

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SUMMARY

The pressure rise in a vacuum system when introducing gas is gas species dependent. Introducing gas at a flow rate of 10 SCCM will not yield the same pressure increase for different gases due to variations in average molecular mass. The average absolute momentum of gas particles differs across species, affecting the pressure response in a closed system. Therefore, calibrating flow controllers requires an understanding of these differences in gas behavior.

PREREQUISITES
  • Understanding of gas laws and behavior in vacuum systems
  • Knowledge of molecular mass and its impact on pressure
  • Familiarity with flow measurement units, specifically SCCM (Standard Cubic Centimeters per Minute)
  • Basic principles of momentum in gas dynamics
NEXT STEPS
  • Research the impact of molecular mass on gas pressure in vacuum systems
  • Learn about the calibration techniques for flow controllers
  • Study the principles of gas dynamics and momentum transfer
  • Explore the differences between various gas species in vacuum applications
USEFUL FOR

Engineers, physicists, and technicians working with vacuum systems, flow controllers, and gas dynamics will benefit from this discussion.

Asimonson
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If I introduce a gas into closed vacuum system at a known rate let's say 10 SCCM there will be a subsequent pressure rise over time. Is that pressure rise gas species dependent. If I evacuate the system and introduce a different gas at 10 SCCM should I see the same rate of pressure rise?

Im trying to calibrate some flow controllers with respect to each other and I want to be sure my basic understanding is correct.

Thanks
 
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No, you will not necessarily see the same pressure rise. A given volume of a gas "A" does not necessarily cause the same increase in pressure as another volume of gas "B". This is because the average molecular mass of each gas species are different. This means that the average absolute momentum (ignoring vector direction) of the particles is different for a given volume and temperature across various species.
 

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