Using fire to put out the fire like?

Perhaps you have heard, the best method, perhaps the only one, is to fight a wildfire or burn a prairie to burn forest or grass to the other side. The new fire went toward the flaming pool of fire, robbing its "food".

Blocking method of "using fire to extinguish" the forest fire .

Implementation techniques : using a knife, grass cutting machine, cutting off shrubs, grass, even a wiper machine . creating a white runway to encircle the advance of the fire (or taking advantage of the trail, the road at the side) in front of the advancing nose of the fire, it made 'title bandage' and then waited for the time to set fire to burning the burning material from the edge of the ice to create a new fire with the nose going against the advancing nose of the forest fire which is tending to advance towards the ice that title. The new fire went towards the flaming fire pool, robbing the "burning material " of the big fire. The two fire walls met, the fire immediately turned off, like swallowing each other.

If burning grass on the prairie in the dry season, the above method can be said to be the best, most effective method, to prevent in time and extinguish the fire quickly.

This is also a way of escape of forest firefighters when being chased by fire fighters in situations where they cannot escape.

Below is an excerpt from Kupe's novel 'Grassland' , which depicts the old man trapping the animal and rescuing tourists who are stuck in the fire on the American prairie:

"Suddenly the old man showed a resolute attitude.

- It's time to act - he said.

- You act too late, poor old man! - Mitliton blurted out - Fire was only a quarter of a mile away from us, and the wind was gathering those flames toward us at tremendous speed.

- Ah so! Fire! I cannot fear fire. Come on, grandchildren! Roll up your sleeves, cut this dry grass right away, to free up an empty space.

In front, right near the fire, there must be a stream of air coming back.

In a very short period of time, they cut off a 6 meter diameter road. The old man took the girls to a corner of that large empty land and told them to cover the flammable clothes with blankets. After the defenses were over, he ran to the opposite corner of the clearing, where the towering barbaric fire was frantically attacking them, and he took a handful of the dry hay onto the rack of the gun and burned. Holding flammable dry grass immediately flared up. The old man threw this handful of grass into the tall bush, then returned to the middle of the empty yard, patiently waiting for the results of his actions. The fire thrown by the old man greedily devoured all the dry trees, and in the blink of an eye it spread to the grass .

The fire was getting bigger and bigger, starting to spread to three sides. But on the fourth side, it was blocked by the empty land. The more the fire burned, the more vacant land appeared in front . After a few minutes, the flames on all sides backed away, leaving only the thick cloud of smoke surrounding everyone. , but they were out of danger because the fire was frantically moving forward . "

However, the method of extinguishing fires is not as simple as it was at first glance. Only those who are very experienced can use the method of burning in anticipation to extinguish the fire , otherwise it will bring greater disasters.

If you think about the question below, you will clearly see why doing it requires a lot of experience: Why can the fire burned by the old man catch fire without burning in the opposite direction? Because the wind came from the side of the fire, and brought fire to the travelers! If so, it seemed like the fire burned by the old man would not burn to catch the fire pool but would burn backwards in the grassland. If so, then the passengers could not avoid being burned to death.

In the end, what did the old man trap animals? The trick is to understand a simple physical law. The wind from the burning grassland blew towards the travelers, but in front, right near the fire, there must be a stream of air coming back.

In fact, the air above the sea of ​​fire after warming is lightened and pushed up by new air on all sides (where not yet ignited). So we see, at the border of a certain fire there is a stream of air that draws towards the fire. So, to start fire to catch fire, when the fire spread so close that it felt like there was a flow of air that sucked.

This is also the reason why the old man trapped animals without hurriedly burning fire but calmly waiting for the right opportunity. If that air flow has not yet appeared but soon burned the grass, the fire will spread in the opposite direction, making people in a very dangerous situation. But not too slow, because the fire will come too close.