Fire needs oxygen to burn and keep on burning. Whenever we see something burned completely the flames at the bottom die out first. Why is that? Because the flames at the bottom get covered with the debris and they lose contact with air and most importantly oxygen hence they die out. Only the flames at the top of the debris still manage to keep on burning due to having access to oxygen. In many cases flames are seen to be dying when the area is filled with thick smoke as it also cuts away oxygen supply. So the main point here to consider is cutting away the supply of oxygen of fire to kill it.

What is more effective in killing oxygen in the area than the CO2 (carbon dioxide). It is well known that CO2 being heavier than air creates a blanket on the lower level of air and minifies oxygen levels in the ... Read more »