Which device puts out small fires by ejecting fire-extinguishing chemicals?

• A. A Device That Measures Humidity
• B. A Device That Cools Surfaces
• C. A Device That Vents Smoke
• D. A Portable Device That Puts Out Small Fires by Ejecting Fire-Extinguishing Chemicals

Answer: (D)

Active fire suppression for small fires relies on a device that directly releases an extinguishing chemical to the flame. A portable extinguisher does this by ejecting a suppressing agent that blankets and cools or displaces heat and oxygen, interrupting the chemical reactions happening in the flame. This immediate, localized action is what makes it the most effective option for quickly putting out small fires before they grow. The other devices described don’t actively extinguish flames: measuring humidity is about sensing conditions, cooling surfaces alone slows heat transfer but doesn’t stop the fire, and venting smoke helps safety but doesn’t extinguish the flames.