Extinguishment by Smothering

• Smothering effect of water is when water turn into steam ( liquid to vapour ) , its volumeterc pressure increase about 1000 times . 
• THis saturated steam dislaces an equal amount of air surrounding fire . 
• This will reduce the volume of air ( oxygen ) available to sustain the combustion . 
• Enough steam must be produce to suppress the flame . 
• Foaming agent is added to water to expedite the process of smothering . 
• In the case where oxygen is produced while a burning material decomposes , smothering by any agent ( including water ) is not possible .