🔍 Key Concepts

• Differences in how dry chemical and CO₂ extinguishers attack a fire (smothering vs cooling/displacement of oxygen) • Typical advantages and limitations of CO₂ extinguishers (toxicity, cleanup, range, duration) • What makes an extinguisher provide protection over time versus just immediate knockdown

💭 Think About

• For each choice, ask yourself: does this describe something that dry chemical does noticeably better than CO₂, or is it something they are both known for? • Think about how long each type of extinguisher can discharge and how long the extinguishing effect remains around the fuel after discharge stops. • Consider which statements sound more like a marketing claim than a known technical characteristic of that extinguisher type.

✅ Before You Answer

• Be clear on what CO₂ is known for: non‑conductive, no residue, possible asphyxiation hazard, and behavior in open vs confined spaces. • Recall if dry chemical is usually praised for long-term coverage, personal heat protection, or something more basic like discharge time. • Eliminate any option that would reasonably apply equally to both extinguisher types rather than giving dry chemical a specific advantage.