A Fire Extinguisher Containing Compressed CO₂ Is Used to Put

question 16

Multiple Choice

A fire extinguisher containing compressed CO₂ is used to put out a fire. In spite of being close to the flames, the firefighter notices a white layer of "frost" forming on the exterior of the fire extinguisher can. What's going on?

• A)The gas in the extinguisher is expanding when released, cooling adiabatically.
• B)The gas in the extinguisher is cooling under higher pressure.
• C)The exterior temperature must be dropping.
• D)The fire is pulling heat from the surrounding air.

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