A stored-pressure water-type extinguisher expels water in a solid stream.

A stored-pressure water-type extinguisher expels water in a solid stream.

• A. Solid stream
• B. Mist
• C. Spray
• D. Foam jet

Answer: (A)

A water extinguisher that is stored under pressure sends out a solid stream—a single, continuous jet of water that stays cohesive as it leaves the nozzle. This happens because the unit contains only water with no atomizing or foaming mechanism, so the flow isn’t broken into droplets or mixed with air. That focused jet is ideal for reaching the base of a Class A fire and delivering direct cooling to the fuel. Mist would require a nozzle designed to break the flow into tiny droplets, producing a fine spray that's common with water mist systems. A spray pattern is a broader, less cohesive dispersion of droplets, not the tight jet you get from a solid stream. A foam jet involves mixing foam concentrate with water to create a foamy blanket, which isn’t how a plain stored-pressure water extinguisher operates.

A water extinguisher that is stored under pressure sends out a solid stream—a single, continuous jet of water that stays cohesive as it leaves the nozzle. This happens because the unit contains only water with no atomizing or foaming mechanism, so the flow isn’t broken into droplets or mixed with air. That focused jet is ideal for reaching the base of a Class A fire and delivering direct cooling to the fuel.

Mist would require a nozzle designed to break the flow into tiny droplets, producing a fine spray that's common with water mist systems. A spray pattern is a broader, less cohesive dispersion of droplets, not the tight jet you get from a solid stream. A foam jet involves mixing foam concentrate with water to create a foamy blanket, which isn’t how a plain stored-pressure water extinguisher operates.