Answer :
Final answer:
The correct classification of portable fire extinguishers for fires involving combustible liquids and gases is Class B. These extinguishers are designed to tackle fires caused by materials such as oils, gasoline, and greases. Safety measures must be taken when handling flammable substances, especially around sources of ignition like Bunsen burners.
Explanation:
The classification of portable fire extinguishers used for fires that involve combustible liquids and gases is Class B. These types of fires typically involve substances such as gasoline, oil, grease, and paints, which are known for their flammability.
An extinguisher labeled with Class B is specially formulated to handle such fires and is capable of suppressing fires fueled by combustible liquids and gases.
Methods and Flammability dictate the classification of fire extinguishers and their application. For instance, the safety note on Bunsen Burners reinforces the importance of using correct methods to avoid the flammability risks associated with improper heating of high-boiling or low-flammability substances.
Bunsen burners can ignite most organic compounds if used improperly, thus emphasis is placed on avoiding their use with highly flammable solvents.
Fires involving materials with flash points below 60 °C, such as used solvents and waste oils, ignitable compressed gases, and oxidizers fall under this category and should be mitigated with an extinguisher that is suitable for Class B fires.
