• 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.