To smother a fire, which element must be removed or reduced?

To smother a fire, which element must be removed or reduced?

• A. Oxygen.
• B. Water.
• C. Heat.
• D. Fuel.

Answer: (A)

Smothering a fire works by cutting off the air supply to the flame. A fire needs three things to keep burning: heat, fuel, and oxygen. When you smother, you restrict or remove the oxygen, so the rate of oxidation drops and the fire can no longer sustain itself, eventually going out. Water cools the flame by absorbing heat, which is a different way to stop a fire, not by removing the oxygen. Removing the fuel would starve the flame by taking away the material to burn, which is also effective but not the act of smothering. So the element that must be removed or reduced to smother the fire is oxygen.

Smothering a fire works by cutting off the air supply to the flame. A fire needs three things to keep burning: heat, fuel, and oxygen. When you smother, you restrict or remove the oxygen, so the rate of oxidation drops and the fire can no longer sustain itself, eventually going out.

Water cools the flame by absorbing heat, which is a different way to stop a fire, not by removing the oxygen. Removing the fuel would starve the flame by taking away the material to burn, which is also effective but not the act of smothering. So the element that must be removed or reduced to smother the fire is oxygen.