• As gas escapes from a CO2 cylinder, the entire cylinder becomes noticably colder, and frost forms on the nozzle.
  • A digital thermometer probe strapped to the cylinder registers a drop in temperature.
  • WARNING: open all classroom doors to prevent CO2 buildup.


















        (explain operation of regulator)
        (transport cylinder only with cap on)


  • Closeup of the frosted nozzle.

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