definition backdraft en anglais

less than a minute read 02-11-2024
definition backdraft en anglais

A backdraft is a sudden and violent explosion that occurs when oxygen is rapidly introduced into an environment that has been deprived of it and is filled with flammable gases.

How Does a Backdraft Occur?

Backdrafts typically occur in confined spaces such as buildings that are on fire or have recently been extinguished. When a fire burns, it consumes oxygen, leaving behind a combustible atmosphere. If the fire is extinguished or the oxygen supply is cut off, the flammable gases continue to build up.

When fresh air is introduced into this environment, the oxygen rapidly reacts with the flammable gases, causing a violent explosion. This explosion can be extremely dangerous, as it can launch debris and hot gases at high speed.

Symptoms of a Backdraft

There are several warning signs that can indicate a backdraft is about to occur. These include:

  • Smoke being drawn into the building - This is a sign of a pressure difference between the inside and outside of the building, indicating that the fire is consuming oxygen.
  • Smoke being released from the building in a pulsating manner - This is another sign of pressure changes inside the building.
  • A "whoosh" sound - This is the sound of air rushing into the building as a backdraft is about to occur.

Prevention and Safety

To prevent backdrafts, firefighters should carefully ventilate buildings that are on fire. This helps to remove the flammable gases and prevent them from accumulating.

In addition, firefighters should always wear appropriate protective gear when fighting fires, as they are at risk of injury from backdrafts and other hazards.

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