Which quadrant in the NFPA 704 system measures instability hazards?

• A. Blue
• B. Red
• C. Yellow
• D. White

Answer: (C)

In the NFPA (National Fire Protection Association) 704 system, the quadrant that measures instability hazards is represented by the color yellow. This system utilizes a diamond-shaped label divided into four quadrants, each corresponding to a specific type of hazard: health risks, flammability risks, instability hazards, and specific hazards.

The yellow quadrant specifically addresses the potential for a material to undergo uncontrolled reactions or to explode under certain conditions. A higher number in this quadrant indicates greater instability, meaning that the substance may become volatile or reactive when subjected to heat, shock, or other environmental conditions. Understanding this classification is crucial for emergency responders, as it informs them of the potential dangers associated with the materials they may encounter, allowing them to take the appropriate safety precautions during a hazardous materials incident.