dry powder fire truck working principle

A dry powder fire truck is a specialized firefighting vehicle designed to extinguish fires using dry chemical powder instead of water or foam. It is particularly effective for Class B (flammable liquids) and Class C (energized electrical equipment) fires, where water or foam may be ineffective or dangerous. Dry powder works by interrupting the chemical chain reaction of the fir...

  » The Underlying Logic of Foam Fire Extinguishing   ★. Why can't water extinguish oil fires? • Density difference: Water is heavier than oil and sinks directly to the bottom, never touching the flame.   • Boiling over: The water at the bottom vaporizes instantly upon contact with high temperatures, expanding thousands of times in volume, splattering the o...