Firefighting

THORNTONS RULE AND THE EXTERIOR FOG ATTACK: A PERSPECTIVE

Issue 7 and Volume 149.

THORNTON`S RULE AND THE EXTERIOR FOG ATTACK: A PERSPECTIVE BY JOHN D. WISEMAN, JR. For effective firefighting, firefighters must have a thorough and accurate knowledge of fire behavior. Fire behavior is defined as what happens in a structure when fire occurs where the only controls are those factors built into the structure itself. Most often, the process of combustion involves the burning of organic solids. These materials may be simple or highly complex compounds with carbon as the principal element. Almost all contain hydrogen. Many contain oxygen, nitrogen, and other elements in smaller amounts. The products of combustion are heat, water (H2O is an oxide of hydrogen), and carbon dioxide (CO2). Incomplete combustion results in the formation of carbon monoxide (CO) and soot–a carbonaceous particle. The heat of combustion is the amount of heat released by a substance and is measured by megajoules per kilogram (MJ/kg). A joule is an…

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