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Ball and Ring Expansion

Materials
2
Difficulty
1
Safety
2
A ball and ring kit contains a metal ball that just doesn't fit through a ring. Heating the ring or cooling the ball in liquid nitrogen allows it to fit.
  • Notes
    Ball and ring kits can be bought through laboratory suppliers.
  • Web Links
    buphy.bu.edu/~duffy/thermo/4A30_21.html
    Author : BU Physics
    Description :
    www.physics.usyd.edu.au/super/therm/tpteacher/demos/ballring.html
    Author : The University of Sydney
    Description :
  • Videos
    www.youtube.com/watch?v=MXk57NIM3w8
    Author : IPS Science Department
    Description :
    www.youtube.com/watch?v=QNoE5IoRheQ
    Author : NCSSMDistanceEd
    Description :
    www.youtube.com/watch?v=OSgrwivwCZE
    Author : NormandinEdu
    Description :
  • Publications
    Sutton, "Demonstration Experiments in Physics", H-15, page 198.
  • Categories
    Liquid Nitrogen | Metals and Alloys | Heat
Materials
1: Easy to get from supermarket or hardware store
2: Available in most school laboratories or specialist stores
3: Requires materials not commonly found in school laboratories

Difficulty
1: Can be easily done by teenagers
2: Can be done by science teachers
3: May require a more experienced teacher

Safety
1: Minimal safety procedures required
2: Some safety procedures required to perform safely
3: Only to be attempted with adequate safety procedures and trained staff

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