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Question:

Ryan Hunter - Reay 2014 Indy 500 champion: Your thoughts?

Ryan Hunter - Reay 2014 Indy 500 champion: Your thoughts?

Answer:

CO2 does not support combustion, so it smothers the fire by excluding air. It is also both heavier than air and, when released from a pressurized container, is cooler than the surroundings, both of which help its smothering effect.
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