Question

Why co2 is used to stop fire?

Answer 1

when CO2 is put over fire the primary attack is on the oxygen content of the atmosphere. The introduction of CO2 into the fire zone displaces sufficient oxygen in the atmosphere to extinguish the open burning.

Answer 2

This is because CO2 does not support combustion & extinguishes fire.

We know that oxygen is required for combustion.

When CO2 is sprayed over fire it replaces oxygen and hence stops combustion.

Hope it helps...............