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

[fizzyfiz]

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!

 

[mfb]

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.

 

[fizzyfiz]

Have you got an idea, how to measure and change cloud density? I need this for my physics experiment

 

[mfb]

If it is not too thick: Measure the amount of light that passes through?

 

[fizzyfiz]

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

 

[mfb]

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.

 

[fizzyfiz]

It might be good idea, the only assumption is that density of cloud is the same in all parts

 

[mfb]

Should be a pretty good assumption (and one you can check, too). Repeatability is another concern.