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Fire needs three things to burn: fuel, oxygen, and heat. Take away one or more of those three things in sufficient quantities, and the fire can no longer burn.
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A dry chemical fire extinguisher sprays a noncombustible, air resistant layer of foam designed to cover the fire's fuel source. When the fuel source (wood, oil, cloth, etc.) is completely and properly smothered, the expelled dry chemical foam isolates the fuel from the surrounding air, and thereby starves the fire of the oxygen it needs to burn.
What else can I help you with?
What type of fire extinguishher for gasoline and varnish?
Class B fire extinguishers are used to flammable fires (such as those caused by gasoline and varnish). They come in several types, such as carbon dioxide (works by displacing the oxygen in the room) or dry chemical extinguishers.
How do different fire extinguishers put out fires?
One group of fire extinguishers works by separating oxygen from the fire, for example by placing a non-flammable powder over the flame source. This works well for some grease fires. Another group of fire extinguishers works by displacing oxygen; fires will only burn most materials with atmospheric concentrations of oxygen above around 10%. These extinguishers use CO2 or nitrogen or Halon (tm) to displace the oxygen. This often works well around electrical fires. The technique is used around equipment that water or powders might destroy. Another type of extinguisher propels water at the fire, sometimes using pressure created when acid contacts a base like soda. The water cools the burning material to below the combustion point, and the water vapor helps displace oxygen that would feed the fire. This works well with wood and paper fires.
Why is a shark designed like it is?
Because it works for them.
What was General Grant's first course of action in destroying the salt works in Virginia?
General Grant's first course of action to destroy the South's salt works in Virginia was to launch cavalry raids into southwestern Virginia. These raids also were designed to destroy the South's valuable railway links that transported salt to parts of Virginia.
Where was the Spitfire designed?
The Spitfire was designed at Supermarine Aircraft Works, Woolston, Southampton, England.
What has the author Norman Spittle written?
Norman Spittle has written: 'A few examples of architectural and general metalwork designed and made by Norman and Ernest Spittle at their studio and works'
Which general reference works include the Who is Who series?
Biographical reference works
How do you know when your circuit works?
You know your circuit works when it does what you designed it to do, and prefferably as little else as possible.
Are fire works a physical change?
Chemical.
Where was SR-71 Blackbird designed and Built?
They were designed and built at Lockheed "Skunk Works " in Burbank, California
Is there a enginneer that works on guns?
Firearms may be designed by an engineer.
General Works in Dewey Decimal Classification System meaning an examples?
General Works falls under Generalities, which is class 000 of the Dewey Decimal Classification System. Examples include: 000 (Computer Science general works), 017 (general subject catalogs), and 080 (general collections).
