FSC239Y5 Lecture Notes - Lecture 30: Acetylene, Fire Triangle, Flammability Limit
Document Summary
Fsc239 lecture 32: centre of forensic science chemistry section (fire) What is fire: a rapid oxidation process of a fuel accompanies by the evolution of varying intensities of heat and light, a chemical reaction, ch4 + o2 co2 + h2o + heat + light. Requirements: oxygen, propellant (fuel, emission source (competent ignition source) Is it possible to have too much or too little fuel: yes. Fuel rich and fuel lean situations can occur. Lower flammable range (fuel lean) or lower flammable explosive (fuel rich: 1. 4% lower limit, 7. 6% upper limit, examples. Acetylene 2. 5-100 (technically 80 since there is no oxygen at 100%) Cigarettes: are not able to ignite most ignitable liquids and gases. Temperature is high enough, but amount of heat energy is not. Ash on cigarette tip insulates and is much cooler than centre of top.
