Fire fighting is the act of carrying out procedures to extinguish an unwanted fire. A fire fighter performs fire fighting and prevents fires and destruction of life and property threatened by fire. In all but the most trivial cases, knowledge and expertise are necessary for successful and safe fire-fighting.

Historically, fire scientists created a graphical representation detailing the three elements fire needs to start (fire triangle). In recent years, one more point has been added, creating the fire tetrahedron.

The four elements needed for combustion (a form of oxidation; see the article on combustion) are:

• combustible matter (fuel): paper, wood, gasoline, oil, gas, etc.;
• a combustive agent, i.e. an oxidant, usually the oxygen of the air;
• activation energy: heat, spark (electricity), etc.
• a chemical chain reaction needed to sustain fire.

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NPR Topics: Politics & Society

Alaska Gov. Palin To Resign
Fri, 03 Jul 2009 19:44:00 -0400
Alaska Gov. Sarah Palin, who was Republican Sen. John McCain's running mate in the 2008 presidential campaign, says she will resign from office July 26.
Gov. Ted Strickland On Ohio's Budget Impasse
Fri, 03 Jul 2009 16:45:00 -0400
Ohio is facing a $3.2 billion shortfall in its finances. Gov. Ted Strickland has proposed slots at racetracks and spending cuts, but has not been able to reach a deal with the Legislature. The state is operating on a temporary budget for the next few days.
Rare Copy Of Declaration Found In England
Fri, 03 Jul 2009 16:00:00 -0400
An original copy of the Declaration of Independence was recently discovered in the British National Archives. Edward Hampshire, the diplomatic and colonial specialist at the archives, talks with Melissa Block about the discovery of the 26th copy of the document.

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James Surowiecki Mon, 29 Jun 2009 04:00:00 -0000
In 1937, the Massengill Company began selling a health product called Elixir Sulfanilamide, which contained one of the antibiotic sulfa drugs. Unfortunately, it also contained diethylene glycol, a solvent that happens to be deadly to humans. In a matter of months, the elixir killed more than a hundred consumers. The . . .
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Hendrik Hertzberg Mon, 29 Jun 2009 04:00:00 -0000
The most improbable of America’s mass movements for civil rights--improbable at the time, inevitable in retrospect--got its start at a most improbable hour in a most improbable place. The hour: two in the morning, forty years ago. The place: the sidewalk in front of the Stonewall Inn, a . . .

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