Ch. 6: What is Water and Where Does it Come From? Flashcards Preview

Pumping Apparatus D/O Handbook 2e > Ch. 6: What is Water and Where Does it Come From? > Flashcards

Flashcards in Ch. 6: What is Water and Where Does it Come From? Deck (134)
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1

What by far, remains the most commonly used fire extinguishing agent?

water

2

What is water considered for all practical purposes?

incompressible

3

What abilities does water have to extinguish a fire?

cooling, absorbing heat from the fire; smothering, excluding oxygen

4

What govern the heat-absorbing ability of water?

specific heat and latent heat of vaporization

5

What is a measure of the heat-absorbing capacity of a substance?

specific heat

6

What is the amount of heat required to raise the temperature of 1 pound of water 1 degree F?

A BTU

7

What is the ratio between the amount of heat needed to raise the temperature of a specified quantity of a material and the amount of heat needed to raise the temperature of an identical quantity of water by the same number of degrees?

specific heat of any substance

8

Water absorbs ______ times as much heat as does an equal amount of carbon dioxide.

five

9

What is the quantity of heat absorbed by a substance when it changes from a liquid to a vapor?

latent heat of vaporization

10

What is the temperature at which a liquid absorbs enough heat to change to vapor known as?

boiling point

11

At its boiling point of 212 degrees F, water expands approximately how much its original volume?

1700 times

12

What is the tendency of a liquid to possess internal resistance to flow?

viscosity

13

What is the density of liquids in relation to water known as?

specific gravity

14

What is defined as force per unit area?

pressure

15

What is a simple measure of weight and is usually expressed in pounds or kilograms?

force

16

What is the weight of 1 cubic foot of water?

~62.5 lbs

17

What is the speed at which fluid travels referred to as?

velocity

18

What is considered standard atmospheric pressure?

At sea level, 14.7 psi

19

What is any pressure that is less than atmospheric pressure called?

vacuum

20

What is absolute zero pressure called?

a perfect vacuum

21

What misnomer do gauge readings of less than 0 psi or kPa often referred to in the fire service?

"negative pressure"

22

What is referred to the height of a water supply above the discharge orifice?

head

23

What is the stored potential energy available to force water through pipe, fittings, fire hose, and adapters?

static pressure

24

What is the pressure in a water system before water flows from a hydrant considered as?

static pressure

25

What is pressure found in a water distribution system during normal consumption demands?

normal operating pressure

26

What is that part of the total available pressure not used to overcome friction loss or gravity while forcing water through pipe, fittings, fire hose, and adapters?

residual pressure

27

What means a remainder or that which is left?

residual

28

What that forward velocity pressure at a discharge opening while water is flowing?

flow pressure

29

What refers to the center line of the pump or the bottom of a static water supply source above or below ground level?

elevation

30

What is the position of an object above or below sea level?

altitude