Cooling (Removing Heat): The most common method involves applying a substance like water to absorb the thermal energy. Water is highly effective because it has a high specific heat capacity, meaning it can absorb a significant amount of heat as it turns into steam.
Smothering (Removing Oxygen): This technique involves creating a physical barrier between the fire and the atmosphere. Tools like fire blankets, carbon dioxide () extinguishers, or specialized foams displace or block oxygen from reaching the fuel surface.
Starving (Removing Fuel): This is often a preventative measure or a long-term firefighting strategy. Examples include creating 'fire breaks' in forests by clearing vegetation or shutting off gas valves to stop the flow of combustible material.
Identify the Limiting Factor: In exam scenarios involving fire safety, always identify which side of the triangle is being targeted by a specific action. If a door is closed, the strategy is oxygen limitation (smothering).
Check for Secondary Effects: Be aware of the risks associated with certain methods. Water is a conductor, so it should never be used on electrical fires, as it introduces a risk of electrocution while attempting to remove heat.
Surface Area Logic: Remember that increasing the surface area of a fuel (like wood shavings vs. a log) makes it easier to ignite because more fuel is in contact with oxygen and heat simultaneously.
