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Flashcards in Chpt 4 Deck (72)
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1

The basic plan for fighting most fires depends on having an adequate supply water to confine, control, and

Extinguish the fire

2

Ensuring a dependable _______is a critical fire ground operation that must be accomplished as soon as possible

Water supply

3

At Any scene, you will obtain water from one of two means;

Pressurized systems and Static water sources

4

Pressurized sources may be either ______ which furnish water under pressure through fire hydrants

Municipal water systems or private water systems

5

Are sources such as lakes, ponds, rivers, and streams.

Static water supplies

6

The establishment of an adequate, continuous _____ then becomes a primary objective to support the fire attack

Water supply

7

Approximately _____ percent of the earths surface is covered by water .

70 to 75

8

The ______ allows water to flow, puddle, and remain together even after leaving the nozzle

Surface tension

9

As water passes through or moves by a substance, the positive and negative charges of the molecule take the various chemicals, minerals, and solvents along with it, thus earning water the title of ____

Universal solvent

10

Water has been used as the primary extinguishing agent in the fire service from the earliest days, mostly because of its

Wide spread availability

11

The amount of heat energy required to increase the temperature of a substance is known as its

Specific heat index

12

Waters specific heat index is

1

13

Water absorbs almost ____ more heat than sodium bicarbonate

5 times

14

Water in its liquid form weighs 8.3 pounds per gallon, adding ______ of weight to the chassis of an engine with a 750 gallon tank.

6248 pounds

15

Whereas its high heat absorption allows water to have notable cooling effects, water may be also converted to gas through the application of heat, an effect attributable to its high ______

Heat of vaporization

16

Water at ___ is almost one half pound heavier than water at 100F

32 F

17

The volume of water vapor is _____ times greater than that of an equal amount of liquid water; as a consequence, water displaces oxygen and effectively smothers the fire.

1700 times

18

The amount of particulate matter suspended in water is known as ____

Turbidity

19

The color of water is is directly related to the level of _____ present

Turbidity

20

The amount of dissolved calcium and magnesium which increases the mineral content within water, determines the waters

Level of hardness

21

Takes place when two dissimilar metals are immersed in water

Galvanic corrosion

22

Prevent or limit the flow between the two metals, thus limiting the erosion or pitting of the metals

Sacrificial anodes

23

Municipal water systems can draw water from wells, rivers, streams, lakes, or human made storage facilities called

Reservoirs

24

Municipal water systems also include a _________, where impurities from the water are removed

Water treatment facility

25

The distribution system delivers water from the treatment facility to the end users and fire hydrants through a complex network of underground pipes, known as

Water mains

26

Driver operators must understand their water distribution systems and typical operating pressures; however it is recommended that hydrant have a minimum operating pressure of

20 psi

27

Most ______rely on an arrangement of pumps to provide the required pressure, either directly or indirectly

Water distribution systems

28

Most municipal systems have multiple pumps and back up power supplies to reduce the risk of a service interruption due to a

Pump failure

29

In a _____, the water source, treatment plan, and storage facilities are located on Highground while the end-users live in lower lying areas, such as a community in a valley

Gravity feed system

30

Most municipal water supply systems use a combination of _______to deliver water.

Pumps and gravity