OPSC 2016 Solved Paper

A fire extinguisher is an active fire protection device used to extinguish or control small fires, often in emergency situations. Carbon Dioxide forms the best type of fire extinguisher. Carbon dioxide extinguishes fire mainly by displacing oxygen. It was once thought that it worked by cooling, although this effect on most fires is negligible. This characteristic is well known and has led to the widespread use in fire extinguishers.