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

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In summary, vacuum is typically measured in units of Hg (inches of mercury) or Torr (millimeters of mercury). To calculate the amount of Hg in a vacuum, you can divide the atmospheric pressure (measured in mbar or Torr) by two. This is often done using a mercury manometer, though there are other methods available.
  • #1
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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  • #2
wouldn't it be just Pressure/2 ?
 
  • #3
See the Wikipedia articles on the Torr (a.k.a. "mm Hg") and the barometer (paying particular attention to the "mercury barometer."
 
  • #4
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
 
  • #5
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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1. How is vacuum measured in scientific experiments?

Vacuum is measured using a unit called Torr, which is a measure of pressure. It is equivalent to 1 millimeter of mercury (mmHg). Scientists use a vacuum gauge, such as a manometer or a barometer, to measure air pressure and calculate the level of vacuum.

2. What is the standard unit of measurement for vacuum?

The standard unit of measurement for vacuum is Torr, which is equivalent to 1 millimeter of mercury (mmHg). Other common units used to measure vacuum include pascal (Pa), bar, and atmosphere (atm).

3. How is vacuum pressure converted to other units of measurement?

Vacuum pressure can be converted to other units of measurement using conversion factors. For example, 1 Torr is equal to 133.3224 pascals (Pa), 0.001 bar, and 0.0013158 atmosphere (atm). Scientists can use these conversion factors to convert vacuum pressure to the desired unit of measurement.

4. Why is vacuum pressure important in scientific experiments?

Vacuum pressure is important in scientific experiments because it affects the behavior of gases and their interactions with other materials. By creating a vacuum, scientists can control the environment and study the properties and reactions of gases without interference from air molecules. Vacuum pressure is also crucial in certain industrial processes, such as semiconductor manufacturing and vacuum distillation.

5. How accurate are vacuum measurements in scientific experiments?

The accuracy of vacuum measurements in scientific experiments depends on the type of vacuum gauge used and the calibration of the equipment. Most vacuum gauges have an accuracy of +/- 0.1% to +/- 1% of the measured value. However, in highly precise experiments, specialized vacuum gauges with accuracies of +/- 0.01% or better may be used.

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