How to work out vacuum in in.hg

  • Context: High School 
  • Thread starter Thread starter deathlucky
  • Start date Start date
  • Tags Tags
    Vacuum Work
Click For Summary

Discussion Overview

The discussion revolves around calculating the amount of air in bottles with different vacuum levels measured in inches of mercury (in.hg). Participants are exploring how to relate these vacuum measurements to the density of air under atmospheric pressure.

Discussion Character

  • Exploratory, Technical explanation, Homework-related

Main Points Raised

  • One participant inquires about calculating the amount of air in three bottles with vacuums of 10 in.hg, 20 in.hg, and 30 in.hg.
  • Another participant suggests using the ratio of densities to the density at atmospheric pressure as a method for the calculation.
  • A subsequent participant seeks clarification on what the specific ratio is.
  • One participant provides information that atmospheric pressure at sea level is approximately 30 inches of mercury.

Areas of Agreement / Disagreement

The discussion does not appear to reach a consensus on the specific ratio needed for the calculations, and multiple viewpoints regarding the approach to the problem remain unresolved.

Contextual Notes

There are limitations regarding the assumptions made about the density of air and how it relates to the vacuum measurements, as well as the lack of specific mathematical steps provided in the discussion.

deathlucky
Messages
10
Reaction score
1
im just wondering to work out vacuum in in.hg say if i have 3 1 letter bottles they have vacuums of 10 in.hg 20 in.hg 30 in.hg how much air will be in the bottles

cheers
 
Physics news on Phys.org
Just ratio the densities to the density at atmospheric pressure.
 
ok but what is the ratio
 
Atmospheric pressure at sea level is around 30 inches of mercury
 

Similar threads

Graduate Phase changes in relation to pressure changes
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Vacuum pump operating at high altitude
  • · Replies 18 ·
Replies
18
Views
3K
High School Vacuum surface area balance and force
  • · Replies 4 ·
Replies
4
Views
1K
High School Vacuum Audio Failure: Solutions & Tips
  • · Replies 26 ·
Replies
26
Views
3K
Vacuum furnace argon fill system — advice needed
  • · Replies 3 ·
Replies
3
Views
848
High School Velocity of freefalling bodies after 1s, 2s, 3s, etc
  • · Replies 18 ·
Replies
18
Views
2K
High School Strain on a foil sheet separating two compartments in a cylinder
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Working in a Vacuum & zero gravity
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad How does a vacuum ejector using air work?
  • · Replies 9 ·
Replies
9
Views
3K
Undergrad Seemingly a contradiction of conservation of energy?
  • · Replies 51 ·
2
Replies
51
Views
5K