cloud in a bottle, why does alcohol work better than water?

  • 1 Replies

0 Members and 1 Guest are viewing this topic.


Offline mcjhn

  • Jr. Member
  • **
  • 23
    • View Profile
Does anyone know exactly how this works?
newbielink: [nonactive]
I searched the forum and there have been some mentions of this experiment but I still have a question

Is the result entirely down to changing temperature?
expansion > cools > vapour condenses > droplets form?
compression > heats > droplets vaporise?

You can do a similar experiment just with water but I was told a cloud requires smoke particles (from a match) to act as Cloud Condensation Nuclei (same job as silver iodide in cloud making machines).
(Description of experiment here > newbielink: [nonactive])

Is it because the change in vapour pressure is greater for alcohol?

any help much appreciated

graph done by geogebra

« Last Edit: 12/05/2011 01:13:38 by mcjhn »


Offline lightarrow

  • Neilep Level Member
  • ******
  • 4586
    • View Profile
I think your analysis is correct.