In fires, which oxidizer is most commonly involved?

In fires, which oxidizer is most commonly involved?

• A. Carbon fuels
• B. Methane
• C. Oxygen
• D. Ozone

Answer: (C)

At the heart of combustion is the oxidizer—the substance that accepts electrons in the chemical reaction. In most fires, that role is played by oxygen from the surrounding air, which together with heat and fuel sustains burning. The other items describe what fuels do or a less common oxidizer: carbon fuels and methane are fuels that burn, not the substance enabling the reaction, and ozone is a potent oxidizer but isn’t normally present in the environment at fire-ready levels to drive ordinary fires. So the oxidizer most commonly involved in fires is oxygen.

At the heart of combustion is the oxidizer—the substance that accepts electrons in the chemical reaction. In most fires, that role is played by oxygen from the surrounding air, which together with heat and fuel sustains burning. The other items describe what fuels do or a less common oxidizer: carbon fuels and methane are fuels that burn, not the substance enabling the reaction, and ozone is a potent oxidizer but isn’t normally present in the environment at fire-ready levels to drive ordinary fires. So the oxidizer most commonly involved in fires is oxygen.