What is Fire?

Fire grows, and as it spreads, it creates new fires that spread out and make new fires of their own. - Dan Wells

What is Fire?

Fire is the rapid oxidation of material in chemical process of combustion, which occurs when fuel and oxygen interact in the presence of sufficient heat to cause ignition.

The Fire Triangle

The triangle illustrates the three elements: fuel, oxygen and heat.

source

• Fuel

  The word Fuel describes any combustable material, regardless of wethere it is fas, a liquid or a solid.

• Oxygen

  The right concentration of oxygen is required to sustain combustion.

• Heat

Heat is a form of energy termed thermal energy. Sufficient thermal energy must be applied to raise the combustible material to its ignition temperature. Sparks, arcs, flames, friction all release thermal energy.

Classes of Fire

• Class A

  Describes fires of ordinary combustible materials, such as wood, cloth, paper, rubber and many plastics.
  can be extinguished by:

  • water (red),
  • foam (red with a cream band or all cream), and;
  • dry powder (red with blue band or all blue) and;
  • wet chemical (red with a gold band or all gold)

• Class B

  Describes fires of flammable liquids and gases. Combustible liquids, petroleum greases, tars, oils, oil-based paints, solvents, lacquers and alcohols, butane, propane and methane are the most common fuels for this class.
  can be extinguished by:

  • foam (red with a cream band or all cream),
  • carbon dioxide (red with ablack band or all and;
  • dry powder (red with blue band or all blue)

• Class C

  Describes fires involving energised electrical equipment.
  can be extinguished by:

  • carbon dioxide (red with ablack band or all and;
  • dry powder (red with blue band or all blue)

• Class D

  Describes fire of combustible metals, such as magnesium, titanium, sodium, lithium, and potassium.
  can be extinguished by:

  • dry powder (red with blue band or all blue)

• Class K

  Describes fire in cooking appliances that involve combustible cooking materials. K class fires commonly occur in commercial kitchens and food preparation facilities that use deep fryers.
  can be extinguished by:

  • wet chemical (red with a gold band or all gold)

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You are Fire but don’t cause Fire!

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