What are mode of Spread of Fire ?

Fire spreads by
CONDUCTION: transfer of heat through solid body.
  • — Transfer of heat through a solid body such a metals as a very good conductor of heat.
  • — Since most ships are constructed by metal, heat transfer by conduction is a potential hazard.
  • Fire can easily move from one compartment to another, one deck to another, and one compartment to another because of heat conduction.
  • Heat is being conducted to the adjoining spaces by the metal deck and bulkhead, then the bulkhead paint is blistering (extremely hot) because vapourization has already begun.
An example of conduction:

The temperature along the rod rises because of the increased movement of molecules from the heat of the flame.

CONVECTION: through the motion of heated matter, i.e. through the motion of smoke, air, gases etc. produced by fire.
  • The transfer or carries of heat through a liquid or gaseous body such as movement of smoke, hot air and heated gases produced by fire.
  • — The replacement of hot and cool air to that particular point resulting in reheated and raised the temperature thus create a fire.

CONVECTION:  The transfer of the heat energy by the movement of heated liquids or gases.

  • heat radiation is the transfer of heat from a source without a material substance being involved.
  • Heat radiation is the transfer of heat from a source across the space or travels outward from the fire in  the same manner as light in straight lines to produce vapour and then igniting the vapour.
  • — When contacts a body, it is absorbed, reflected or transmitted. Absorbed heat increases the temperature of the absorbing body.
  • — Heat radiates in all directions unless it is obstructed

Radiation: The transmission of energy as an electromagnetic wave without an intervening medium


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