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Concrete, while generally fire-resistive, can spall under rapid heating. Spalling occurs when moisture trapped within concrete expands into steam, causing surface layers to break off explosively. This weakens structural integrity and exposes steel reinforcement. Firefighter II training emphasizes identifying signs of spalling and recognizing potential collapse hazards. Steel loses strength under heat, glass fractures, and masonry cracks, but spalling is most closely associated with concrete structures.

Demonstrative evidence includes visual aids such as photos or diagrams that illustrate facts in court. Firefighter II training stresses recognizing the difference between physical evidence and demonstrative evidence prepared later.

NFPA 1500 establishes requirements for fire department safety and health programs, including training, PPE, and wellness. Firefighter II training emphasizes compliance with NFPA 1500 to ensure firefighter survival and reduce injuries.

Class A foams reduce water surface tension, improving penetration into wood, paper, and other ordinary combustibles. Firefighter II training stresses Class A foam for wildland, structural overhaul, and Class A fires.

Physical evidence includes tangible items like residues, burn patterns, or debris. Firefighter II training stresses preserving such evidence for investigators. Testimony and reports are documentary or testimonial evidence.