Thermometer with Bead Thermocouple and Fire Extinguisher
Fire Extinguisher

 

Code Number: 4B70.27

Demo Title: Adiabatic Cooling - Fire Extinguisher

Condition: Excellent

Principle: Adiabatic Cooling

Area of Study: Thermodynamics

Equipment: 

Thermometer with Bead Thermocouple and Fire Extinguisher.

Procedure:

Place the bead thermocouple into the small hole drilled for it in the collar of the fire extinguisher.  Secure this in place with a couple of zip ties.  Observe the temperature as you discharge the fire extinguisher.  The temperature should fall well below 0 degrees C.

References:

  • Paul Hewitt, "Figuring Physics", TPT, Vol. 62, #6, Sept. 2024, p. 541.
  • Paul Hewitt, "Figuring Physics", TPT, Vol. 62, #5, May 2024, p. 325.
  • Jacques-Olivier Goussard and Bernard Roulet, "Free Expansion for Real Gases", AJP, Vol. 61, #9, Sep. 1993, p. 845.
  • Julius Sumner Miller, Q81 & A81, Millergrams I – Some Enchanting Questions for Enquiring Minds, p. 52 & 104.

Video Credit: Jonathan M. Sullivan-Wood.

4B70.27 - Adiabatic Cooling - Fire Extinguisher