Problem 4 - Clinical Chemistry

Question

A fire caused by a flammable liquid should be extinguished using which type of extinguisher? a. Class \(B\) b. Halogen c. Pressurized water d. Class \(\mathrm{C}\)

Step-by-Step Solution

Answer

a. Class B

Step 1: Identify the Fire Classifications

Understand the different classifications of fire extinguishers. Class B extinguishers are used for flammable liquids (e.g., gasoline, oil, paint). Halogen extinguishers are typically for specialized equipment like electronics. Pressurized water extinguishers are for Class A fires involving ordinary combustibles (e.g., wood, paper). Class C extinguishers are used for electrical fires.

Step 2: Determine the Appropriate Class

Since the fire is caused by a flammable liquid, identify the classification that is designed specifically for such fires. Cross-reference the types of fires each extinguisher is designed to handle.

Step 3: Select the Correct Answer

Based on the information gathered, choose the correct type of extinguisher for a fire caused by a flammable liquid.

Key Concepts

Class B extinguisher

Class B fire extinguishers are specifically designed to tackle fires that involve flammable liquids. Examples of flammable liquids include gasoline, oil, grease, and paint. Unlike other types of fires, which might involve solids like wood or fabrics, Class B fires involve substances that are often found in homes, garages, and workplaces. These extinguishers contain chemicals that can cut off the oxygen supply, thereby smothering the fire and preventing it from spreading. When using a Class B extinguisher, it's important to aim at the base of the fire and use a sweeping motion to ensure the entire area is covered.

Fire safety

Understanding fire safety principles is crucial to prevent and effectively manage fire emergencies. Knowing the different types of fire extinguishers and their appropriate use is a key part of this. Each fire class represents different materials that fuel fires, requiring specialized extinguishers. Regularly maintaining and checking your fire extinguishers ensures they are ready for use in case of an emergency. Additionally, having an escape plan and conducting regular fire drills can significantly improve safety. Educating everyone in the household or workplace about fire safety measures can help save lives and reduce damage during a fire emergency.

Flammable liquids

Flammable liquids are substances that can easily ignite and sustain a fire. They are commonly used in various applications, from household products to industrial processes. Some examples include gasoline, alcohol, acetone, and oil-based paints. Flammable liquids give off vapors that can mix with air to create a flammable mixture, making them especially hazardous. It's essential to store flammable liquids in proper containers and keep them away from ignition sources like open flames, sparks, or even static electricity. In the event of a fire caused by flammable liquids, using the correct type of extinguisher, such as a Class B extinguisher, is vital to safely control and extinguish the flames.