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

  • Thread starter Thread starter deathlucky
  • Start date Start date
  • Tags Tags
    Vacuum
AI Thread Summary
Vacuum is measured in inches of mercury (Hg) using the concept of atmospheric pressure, where 1 atmosphere equals 760 torr. To determine the vacuum created by removing half the air from a 1L bottle, one would calculate half of atmospheric pressure, resulting in 0.5 atmospheres or 380 torr. The discussion references the mercury barometer as a traditional method for measuring pressure. The simplest calculation involves taking the standard atmospheric pressure of 1000 mbar and dividing it by two. Understanding these measurements is essential for accurately gauging vacuum levels.
deathlucky
Messages
10
Reaction score
1
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 :)
 
Physics news on Phys.org
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.
 
Last edited by a moderator:

Thread 'The Physics of unloading sand from a barge'

I think it's easist first to watch a short vidio clip I find these videos very relaxing to watch .. I got to thinking is this being done in the most efficient way? The sand has to be suspended in the water to move it to the outlet ... The faster the water , the more turbulance and the sand stays suspended, so it seems to me the rule of thumb is the hose be aimed towards the outlet at all times .. Many times the workers hit the sand directly which will greatly reduce the water...
View full post »

Thread 'Why can't Solar panels be hemispherical, or a curved strip type?'

comparing a flat solar panel of area 2π r² and a hemisphere of the same area, the hemispherical solar panel would only occupy the area π r² of while the flat panel would occupy an entire 2π r² of land. wouldn't the hemispherical version have the same area of panel exposed to the sun, occupy less land space and can therefore increase the number of panels one land can have fitted? this would increase the power output proportionally as well. when I searched it up I wasn't satisfied with...
View full post »

Similar threads

I Trouble with Humboldt H12090 aspirator vacuum pump
Replies
1
Views
2K
B Calculating vacuum -- These numbers do not make sense
Replies
30
Views
3K
Vacuum furnace argon fill system — advice needed
Replies
3
Views
134
I Creating a way to protect a peep inside a vacuum chamber for a demonstration
Replies
12
Views
4K
Pulling a vacuum on a heat pump with a recovery machine
Replies
1
Views
3K
Vacuum pump design
Replies
6
Views
2K
Mercury barometer with a small amount of air
Replies
7
Views
2K
How Many Eggs to Turn a 40lb Flywheel in a Vacuum?
Replies
10
Views
811
Blocking Back Of Fan Creates Vacuum In Front?
Replies
8
Views
8K
How does a vacuum pump push gas out of a container?
Replies
3
Views
1K

Hot Threads

Recent Insights

Back
Top