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4B70.20 - Expansion Cloud Chamber

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​4B70.20 - Expansion Cloud Chamber

Preview
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Title4B70.20 - Expansion Cloud Chamber
Objective

Demonstrate the condensation of water due to the adiabatic cooling of water vapor.

StatusAvailable
Assembly Instructions

Setup Time
Operation Time
Preview Time
Operation Instructions
ExportableYes
Demo on DimeYes
PIRA 200Yes
Export Instructions (if different)
HazardsNone
Analysis/Information

Overview

Rising water vapor in the atmosphere experiences a change in pressure that leads to cloud formation.

Analysis
The bottle is partially filled with water, which is swished around to create an abundance of water vapor in the bottle. Then a match is lit and dropped in the bottle, creating smoke that will later initiate nucleation. We cork the bottle and pump air into it.
At some point the cork cannot contain the pressure and pops out. This causes a sudden change in pressure which the water vapor responds to by cooling and forming droplets.

Category4 Thermodynamics
Subcategory4B - Heat and the First Law
Keywordsadiabatic, cooling, water, condensation, cloud
Construction Information
 
  
  
2 liter bottle with bracket
1
cork and tube
1
water - from the tap
(optional) matches
1
bike pump with cork assembly
1