Which of the following materials should be avoided when using a water extinguisher?

Which of the following materials should be avoided when using a water extinguisher?

• A. Wood and paper
• B. Flammable liquids
• C. Metal products
• D. Cooking oils

Answer: (B)

Using a water extinguisher on flammable liquids is highly discouraged because water can spread the fire rather than extinguish it. Flammable liquids, such as gasoline, oil, and paint thinner, do not mix with water; instead, water can cause the burning liquid to float on top, creating a larger surface area for the fire to spread. This not only makes the situation worse but also increases the risk of fire and explosion due to the volatility of these substances. In contrast, water extinguishers are effective on solid combustibles like wood and paper. While they are not suitable for metals or cooking oils either, the key concern with using water is that it exacerbates the danger when employed on flammable liquids, leading to a more hazardous situation.

Using a water extinguisher on flammable liquids is highly discouraged because water can spread the fire rather than extinguish it. Flammable liquids, such as gasoline, oil, and paint thinner, do not mix with water; instead, water can cause the burning liquid to float on top, creating a larger surface area for the fire to spread. This not only makes the situation worse but also increases the risk of fire and explosion due to the volatility of these substances.

In contrast, water extinguishers are effective on solid combustibles like wood and paper. While they are not suitable for metals or cooking oils either, the key concern with using water is that it exacerbates the danger when employed on flammable liquids, leading to a more hazardous situation.