Changes

'''Structural firefighting''' is fighting fires involving [[building]]s and other structures.  Most city firefighting is structural firefighting.  Structural firefighting is what most people think of when they think of what their local "fire department" does.

'''Structural firefighting''' is fighting fires involving [[building]]s and other structures.  Most city firefighting is structural firefighting.  Structural firefighting is what most people think of when they think of what their local "fire department" does.

'''Wildland firefighting''' is fighting [[forest]] fires, brush or bush fires, and fires in other undeveloped areas.  The [[United States Forest Service]] and other government agencies which administer public lands hire a large number of wildland firefighters every [[summer]] when fire conditions are at their peak.

'''Wildland firefighting''' is fighting [[forest]] fires, brush or bush fires, and fires in other undeveloped areas.  The [[United States Forest Service]] and other government agencies that administer public lands hire a large number of wildland firefighters every [[summer]] when fire conditions are at their peak.

'''Proximity firefighting''' is fighting fires in situations where the fire produces a very high level of heat, such as [[aircraft]] and some [[chemical]] fires.  Proximity firefighting is not the same thing as structural firefighting and in some (but not all) cases takes place outdoors.

'''Proximity firefighting''' is fighting fires in situations where the fire produces a very high level of heat, such as [[aircraft]] and some [[chemical]] fires.  Proximity firefighting is not the same thing as structural firefighting and, in some (but not all) cases, takes place outdoors.

'''Entry firefighting''' is a highly specialized form of firefighting involving the actual direct entry of firefighters into a fire with a very high level of heat.  It is not the same thing as proximity firefighting, although it is used in many of the same situations (such as flammable liquid fires).

'''Entry firefighting''' is a highly specialized form of firefighting involving the actual direct entry of firefighters into a fire with a very high level of heat.  It is not the same thing as proximity firefighting, although it is used in many of the same situations (such as flammable liquid fires).

This reduces the heat, hopefully to the point that the fire can no longer burn.

This reduces the heat, hopefully to the point that the fire can no longer burn.

However, water is not suitable for liquid fuel fires, because it is likely to spread the fuel and make the fire larger, nor for electrical fires, because of the risk of electric shock.  

However, water is not suitable for liquid fuel fires, because it is likely to spread the fuel and make the fire larger, nor for electrical fires, because of the risk of electric shock.  

In some cases, water is delivered as a fine mist (using a fog nozzle) to not only cool the area but also to produce steam which dilutes the ambient oxygen.

In some cases, water is delivered as a fine mist (using a fog nozzle) to not only cool the area but also to produce steam, which dilutes the ambient oxygen.

'''Foam:'''  Foam is put onto fires fueled by liquid fuel.

'''Foam:'''  Foam is put onto fires fueled by liquid fuel.

'''Fire breaks:''':  For fires in forested areas, [[bulldozer]]s or other heavy equipment may be used to cut a clear path through the forest in front of an advancing fire, or such fire breaks may be permanently maintained in forested areas.

'''Fire breaks:''':  For fires in forested areas, [[bulldozer]]s or other heavy equipment may be used to cut a clear path through the forest in front of an advancing fire, or such fire breaks may be permanently maintained in forested areas.

Fire breaks provide an area with little fuel content, to stop the fire when it reaches the break.

Fire breaks provide an area with little fuel content to stop the fire when it reaches the break.

However, strong winds might carry sparks from the fire across the fire break to forested areas on the other side.

However, strong winds might carry sparks from the fire across the fire break to forested areas on the other side.

Even so, it may slow down the fire enough for fire crews to cope with the rest.

Even so, it may slow down the fire enough for fire crews to cope with the rest.

'''Back-burning:'': Instead of constructing fire breaks, an area ahead of an advancing fire might be set alight and burnt in a controlled manner to remove the fuel from that area, thus impeding the advance of the main fire.

'''Back-burning:''  Instead of constructing fire breaks, an area ahead of an advancing fire might be set alight and burnt in a controlled manner to remove the fuel from that area, thus impeding the advance of the main fire.

'''Aircraft:'': Both fixed-wing and rotary-wing aircraft (helicopters) are used to drop water onto fires, particularly in areas difficult to reach on the ground.

'''Aircraft:''  Both fixed-wing and rotary-wing aircraft (helicopters) are used to drop water onto fires, particularly in areas difficult to reach on the ground.

== Extinguishers ==

== Extinguishers ==