Which of the following are examples of combustibles?

Which of the following are examples of combustibles?

• A. Wood and paper
• B. Water and sand
• C. Glass and porcelain
• D. Oxygen and nitrogen

Answer: (A)

Combustibles are materials that can burn in air. Wood and paper fit this because they are organic fuels that ignite and sustain a flame when heated. Water and sand don’t burn; they’re used to cool or smother fires, so they’re noncombustible. Glass and porcelain are inorganic and do not burn. Oxygen is needed to support combustion but is not itself a fuel, and nitrogen is inert and does not burn. In a welding context, keeping combustibles away from heat and sparks is essential to prevent fires.

Combustibles are materials that can burn in air. Wood and paper fit this because they are organic fuels that ignite and sustain a flame when heated. Water and sand don’t burn; they’re used to cool or smother fires, so they’re noncombustible. Glass and porcelain are inorganic and do not burn. Oxygen is needed to support combustion but is not itself a fuel, and nitrogen is inert and does not burn. In a welding context, keeping combustibles away from heat and sparks is essential to prevent fires.