Does the Density of a Portable Cloud in a Bottle Depend on Pressure?

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Discussion Overview

The discussion revolves around the relationship between the density of a cloud formed in a bottle and the pressure inside the bottle prior to opening. Participants explore how pressure may influence cloud density, measurement techniques, and experimental considerations.

Discussion Character

  • Exploratory, Technical explanation, Experimental/applied, Homework-related

Main Points Raised

  • Some participants suggest that while the density of the cloud may depend on pressure, the relationship is not straightforward and lacks a simple formula.
  • One participant notes that the amount of vapor does not depend on pressure, but changes in expansion and temperature do.
  • There are inquiries about methods to measure and change cloud density for experimental purposes.
  • Several participants propose measuring the amount of light that passes through the cloud as a way to assess density.
  • It is suggested that the length of light traveled through the cloud could serve as a second parameter for density measurement, assuming uniform density throughout the cloud.
  • Concerns about the assumption of uniform density and the repeatability of measurements are raised.

Areas of Agreement / Disagreement

Participants express varying views on the relationship between pressure and cloud density, and while some assumptions are proposed, there is no consensus on the exact nature of this relationship or the best measurement techniques.

Contextual Notes

Limitations include potential assumptions about uniform density within the cloud and the challenges of ensuring repeatability in measurements.

fizzyfiz
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I met an experiment on youtube, where a man creates a cloud in a bottle. Do density of such cloud depends on pressure inside the bottle before opening? If yes, how?Here is a link!
 
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In general: Yes, but not necessarily with a nice simple formula. The amount of vapor won't depend on the pressure, but the expansion and corresponding temperature change will.
 
Have you got an idea, how to measure and change cloud density? I need this for my physics experiment
 
If it is not too thick: Measure the amount of light that passes through?
 
mfb said:
If it is not too thick: Measure the amount of light that passes through?
That is the meaning of my experiment. I will measure the light passing through cloud depending on density of cloud, but I don't know how to measure density
 
Well, it is a density measurement...
If you need a second parameter you could use the length traveled through the cloud. That is easier to control than droplet density.
 
It might be good idea, the only assumption is that density of cloud is the same in all parts
 
Should be a pretty good assumption (and one you can check, too). Repeatability is another concern.
 

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