Which property of carbon dioxide is applied in extinguishing fire
 

Carbon dioxide extinguishers work because carbon dioxide molecules are heavier than oxygen molecules. When the liquid carbon dioxide inside the extinguisher expands into a gas, the carbon dioxide pushes out any oxygen surrounding the fire. Without oxygen available to fuel the chemical reaction, the fire goes out quickly. This property can also make them dangerous in confined spaces since the carbon dioxide also pushes out any oxygen that the user needs to breathe.

In addition to carbon dioxide extinguishers, fire extinguishers use other methods to put out fires. Wet extinguishers spray a liquid that absorbs heat, similar to pouring water on a campfire. These extinguishers are not suitable for chemical or electrical fires since the liquid can conduct electricity and cause flammable agents to spread. Other extinguishers coat the fuel, forming a barrier between the flammable material and the oxygen in the surrounding air. These are suitable for all types of fires, but the chemicals involved can be expensive and dangerous.

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its non conductivity to fire
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sorry i have answered why carbon dioxide is applied in extinguishing fire 
answer is:
the property used in its heaviness than air. co2​ being heavier than air settles, over the flames cut off contact with O2 
fire cannot continue without the oxygen supply and is extinguished
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The property used is its heaviness than air. CO2 being heavier than air, settles over the flames and cuts off contact with O2. Fire cannot continue without the oxygen supply and is extinguished.
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