Vacuum, atmospheric pressure and constant gravitational acceleration

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SUMMARY

This discussion focuses on the relationship between vacuum pressure measured in inches of mercury (Hg) and gravitational acceleration on low-density particles, specifically coal ash with a density of 721 kg/m3. The inquiry seeks to approximate how varying levels of vacuum pressure, such as 10(-1) in/Hg, affect the acceleration of these particles by negating atmospheric pressure and air drag. The key takeaway is that air drag significantly influences the observed acceleration, necessitating its consideration in any calculations or experiments related to this topic.

PREREQUISITES
  • Understanding of vacuum pressure measurement (inches of Hg)
  • Basic principles of gravitational acceleration
  • Knowledge of air drag effects on falling objects
  • Familiarity with density calculations (e.g., kg/m3)
NEXT STEPS
  • Research the effects of vacuum pressure on gravitational acceleration using physics simulations
  • Explore the mathematical modeling of air drag on falling objects
  • Learn about experimental setups for measuring acceleration in vacuum conditions
  • Investigate the properties of low-density materials and their behavior in different atmospheric pressures
USEFUL FOR

Physicists, engineers, and students interested in fluid dynamics, gravitational studies, and the effects of atmospheric pressure on material behavior.

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This isn't home work, just a curiosity question and I'm obviously under qualified to find the answer.

Looking to approximate how the amount of of vacuum in inches of Hg negate the affects of atmospheric pressure in regards to acceleration.

We all remember when David Scott let loose the hammer and feather.

Let's say we have a quantitive amount of vacuum pressure, how may we approximate the rate of gravitational acceleration on objects with known mass?

For example: Given a particle with a mass of 35 lbs/ft3 (or 721 kg/m3). Happens to be coal ash. What is the given approach to gravity (acceleration) at 10(-1) in/hg of vacuum. 10(-2)...10(-3).

My goal is to approximate the percentage of gain per inch of Hg on particles of low density.

Please, the more rudimentary your answer the better lol.
 
Last edited:
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The reason for the difference in the experiments is air drag. So that is the key factor that has been omitted from your assessment. Go back and analyze it properly including air drag.
 

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