How many gallons of water are contained in a Class A fire extinguisher with a numerical rating of 2?

In the context of Class A fire extinguishers, the numerical rating system helps indicate the amount of water equivalent that the extinguisher can effectively displace. A Class A extinguisher's numerical rating corresponds to the coverage area it can protect, with each number representing a specific volume of water in gallons.

For a Class A extinguisher with a numerical rating of 2, it signifies that the extinguisher can effectively discharge a volume equivalent to 2.5 gallons of water. This measurement is significant because it helps firefighters and users understand the extinguisher's effectiveness in combating Class A fires, which involve ordinary combustibles such as wood, paper, and textiles. The rating thus aids in selecting the appropriate extinguisher type and ensures that the equipment is adequate for suppressing the fire it encounters.