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Flashcards in Chapter 2 Fire Behavior Deck (69)
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1

Fire

A chemical reaction that requires Fuel, Oxygen, & Heat to occur.

A rapid chemical reaction that gives off energy & products of combustion that are very different in composition from the fuel & oxygen that combined to produce them.

Rapid self-sustaining oxidization process accompanied by the evolution of heat & light of varying intensities.

2

Physical Science

Study of the physical world around us and includes the sciences of chemistry & physics and the law related to matter & energy

3

The U.S. uses the English or Customary unit

Other use the Metric or International systems of units (SI)

4

Weight

The measurement of the gravitational attraction on a specific mass (customary unit LB's)

5

Energy

The capacity to perform work.

6

Work

Transformation of energy from on form to another

(When a force is applied to an object over a distance)

(CU="Ft lb") (SI= "Joule")

7

Joule

Unit based on a force in expressed Newtons

8

Types of Energy

Chemical
Mechanical
Electrical
Heat
Light
Nuclear

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Chemical Energy

Energy released as a result of a chemical reaction
(FIRE)

10

Mechanical Energy

Energy a object in motion possesses
(Rolling Rock)

11

Electrical Energy

Developed when electrons flow through a conductor

12

Heat Energy

Transferred between two bodies of differing temperatures.
(Sun & Earth)
Most common on earth

13

Light Energy

Visible radiation produced at the atomic level such as flame produced during the combustion reaction.

14

Nuclear Energy

Energy released when atoms split(Fission) or Join (Fusion).

Nuclear power plants generate power as a result of fission of uranium-235.

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Fission

Atoms split

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Fusion

Atoms join together

17

Energy exists in two states

Kinetic-energy possessed by a object in motion

Potential- Energy possessed by an object that can be released in future. (rock on cliff)

In fire, Fuel is potential chemical energy, as it burns its converted to kinetic energy in the form of heat and light.

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Kinetic Energy

Energy possessed by a object in motion

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Potential Energy

Energy possessed by an object that can be released.

"Rock on a cliff"

20

Power

Amount of energy delivered over a given period of time.

(CU="HP") (SI="WATTS")

21

Calorie

Amount of heat required to raise the temperature of 1 Gram of water 1 degree Celsius.

22

BTU

Amount of heat required to raise 1 Lb of water 1 degree Fahrenheit

23

Mechanical equivalent of heat.

Relationship between the calorie and Joule

1 Calorie= 4.187 Joules
1 BTU= 1,055 Joules

24

Heat can be transferred from one body to another by 3 mechanisms

Conduction
Convection
Radiation

25

Conduction

Point to point contact

*Heat transferred early in the development of all fires is almost entirely due to conduction

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Convection

Transfer of heat energy by the movement of heated liquid of gases

* When fire grows

27

Radiation

Transmission of energy as a electromagnetic wave.
(Light & Radio waves, X-rays)

Travels in a straight line at the speed of light.

Energy travels @ a speed of light from the sun through space"Vacuum" & warms the earth

* Cause of most exposure fires

28

Matter

Anything that occupies space and has mass

Physical appearance/Properties (Mass,Size,Volume)

Physical State (Solid, Liquid, Gas, Color, Smell)

29

Physical appearance/Properties of matter

Mass
Size
Volume

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Physical State of matter

Solid
Liquid
Gas
Color
Smell