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.
smother the fire
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.
Because it works for them.
The Spitfire was designed at Supermarine Aircraft Works, Woolston, Southampton, England.
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.
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.
There is no known author by the name Norman Spittle in literary works or scholarly publications.
You know your circuit works when it does what you designed it to do, and prefferably as little else as possible.
They were designed and built at Lockheed "Skunk Works " in Burbank, California
Chemical.
Firearms may be designed by an engineer.
Biographical reference works
Not sure of an exact chemical but vinegar works