one property that makes co2 gas suitable to be used as fire extinguisher

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CO2 is great for fire suppression for a number of reasons.  CO2 gas is colorless and odorless, which is a bonus for its use.  But the big plus about CO2 is that it is a relatively stable gas.  It doesn't react with much of anything.  That means it doesn't produce...

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CO2 is great for fire suppression for a number of reasons.  CO2 gas is colorless and odorless, which is a bonus for its use.  But the big plus about CO2 is that it is a relatively stable gas.  It doesn't react with much of anything.  That means it doesn't produce any kind of toxic or other by products when it is used to put out a fire.  It's also non-conductive, so a person could spray it on an electrical fire and not worry about it. CO2 is also a good fire suppressant because it works against 2 parts of the "fire triangle."  The fire triangle is composed of fuel, oxygen, and heat.  Those three things together provide an environment that is conducive to fire.  CO2 works against the oxygen and heat components.  A CO2 extinguisher first displaces a lot of oxygen near the fire.  Without oxygen, the fire is robbed of its ability to "breathe."  Second, when the CO2 gas comes out, it expands and rapidly cools.  That reduces a lot of the potential heat that might cause another flare up. 

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