Answer :
Final answer:
The classification of portable fire extinguisher used for fires involving combustible liquids and gases is Class B. These extinguishers are designed to extinguish fires from flammable liquids or gases and are essential in places handling such materials.So, the correct option is B.
Explanation:
The classification of portable fire extinguisher used for fires that involve combustible liquids and gases is Class B. These types of extinguishers are designed to put out fires that originate from flammable liquids or gases, such as petroleum-based oils and greases, tars, oil-based paints, solvents, lacquers, or alcohols. The description of waste liquids with flash points below 60 0C, such as used solvents and waste oils, non-liquids that cause fire through specific conditions, ignitable compressed gases, and oxidizers, also indicates that a Class B extinguisher would be most suitable.
Class B fire extinguishers work by creating a barrier between the oxygen element and the fuel element on Class B fires. Situations where you might encounter such flammable materials include environments using dry-cleaning solvents, certain fire extinguisher systems, and places with foaming plastics or refrigerants. While extinguishers can also come in multi-class categories like AB or BC, it is essential to use the appropriate extinguisher based on the specific type of fire you're encountering.
It is also important to note that Class A extinguishers are for ordinary combustibles like wood and paper, Class C is for electrical fires, and Class D is for flammable metals. Fires involving cooking oils and fats are best tackled with a Class K extinguisher, which is common in commercial kitchens.
