What Creates a Stronger Vacuum: 15inHG or 10inHG?

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SUMMARY

A vacuum is measured in inches of mercury (inHG), where a higher inHG value indicates a weaker vacuum. Specifically, 15 inHG represents a stronger vacuum than 10 inHG. Additionally, when measuring vacuum pressure, lower values indicate a stronger vacuum; for instance, a vacuum of 76 mTorr signifies a pressure that is 10e-4 times smaller than ambient pressure. Higher vacuum levels can be quantified in the range of 10^-5 to 10^-7 Torr.

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  • Understanding of vacuum pressure measurement units, specifically inHG and mTorr
  • Knowledge of gauge pressure versus absolute pressure
  • Familiarity with the concept of Torr and its relation to mmHg
  • Basic principles of atmospheric pressure
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  • Explore the significance of mTorr in high vacuum applications
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Engineers, physicists, and anyone involved in vacuum technology or pressure measurement will benefit from this discussion.

Ruffian
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Im just wondering, is a higher or lower reading of a number in inHG units indicating a stronger or weaker vacuum?

For Example:
What is creating a stronger vacuum?
15inHG or 10inHG

Thanx,
 
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Often vacuums are measured in inHG (aka: inches of mercury) below atomospheric pressure (as a gauge pressure). Thus 15 inHG would be a stronger vacuum than 10 inHG.

But inHG can also used as a direct measure of pressure (conventional or absolute pressure), in which case: the lower the pressure, the stronger the vacuum.
 
We often use the unit mTorr to indicate vacumm. 1 Torr equals 1mmHg. So the vacuum reaches 76mTorr means the pressure is 10e-4 times smaller than the ambient pressure. Higher vacuum (lower pressure) can be measured in 10^-5 - 10^-7 Torr.
 

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