How Vacuum is Measured: Understanding the Measurement of Vacuum in Hg Units

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SUMMARY

Vacuum measurement in inches of mercury (Hg) is directly related to atmospheric pressure. At sea level, 1 atmosphere equals 760 Torr, which translates to 1000 mbar. To calculate the vacuum created by removing half the air from a 1L bottle, one must halve the atmospheric pressure, resulting in 0.5 atmospheres or 380 Torr. This method utilizes a mercury manometer, a traditional tool for measuring pressure in Hg units.

PREREQUISITES
  • Understanding of atmospheric pressure and its measurement in Torr and mbar.
  • Familiarity with the concept of vacuum and its relation to pressure.
  • Knowledge of how a mercury manometer functions.
  • Basic grasp of units of measurement in physics.
NEXT STEPS
  • Research the operation and calibration of mercury manometers.
  • Learn about the differences between Torr, mbar, and other pressure units.
  • Explore the principles of vacuum creation and measurement techniques.
  • Investigate modern alternatives to mercury manometers for vacuum measurement.
USEFUL FOR

Students in physics, engineers working with vacuum systems, and anyone interested in pressure measurement techniques will benefit from this discussion.

deathlucky
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just wondering how vacuum is measured in Hg say is i had a 1L bottle and was to suck half the air out how much Hg would that be?

cheers :)
 
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wouldn't it be just Pressure/2 ?
 
See the Wikipedia articles on the Torr (a.k.a. "mm Hg") and the barometer (paying particular attention to the "mercury barometer."
 
Pressure is measured in Atmospheres or Torres. At sea level on Earth you should experience 1 Atmosphere. An Atmosphere is 760 torres so you cut that in half and you'd have a .5 Atmospheres or 380 torres
 
HI to measure vacuum in hg..that inches of mercury ..thats an old method using a mercury manometer. the simplest andswer is half atmosheric pressure 1000mbar divided by two.
 
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