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Forensics > Fire and Explosion > Flashcards

Flashcards in Fire and Explosion Deck (32):
1

modus operandi

an offender's pattern of operation

2

oxidation

combination of oxygen with other substances to produce new substances

3

energy

the ability or potential to do work

4

combustion

the rapid combination of oxygen with another substance, accompanied by the production of noticeable heat and light

5

heat of combustion

the heat liberated during combustion

6

ignition temperature

the minimum temperature at which a fuel spontaneously ignites

7

flash point

the minimum temperature at which a liquid fuel produces enough vapor to burn

8

pyrolysis

the decomposition of solid organic matter by heat

9

flammable range

the entire range of possible gas or vapor fuel concentrations in air that are capable of burning

10

glowing combustion

combustion on the surface of a solid fuel in the absence of heat high enough to pyrolyze the fuel

11

spontaneous combustion

a fire caused by a natural heat-producing process in the presence of sufficient air and fuel

12

accelerant

any material used to start or sustain a fire

13

hyrdocarbon

any compound consisting of only carborn and hydrogen

14

explosion

a chemical or mechanical action caused by combustion and accompanied by the creation of heat and the rapid expansion of gases

15

oxidizing agent

a substance that supplies oxygen to a chemical reaction

16

deflagration

a very rapid oxidation reaction accompanied by the generation of a low-intensity pressure wave that can disrupt the surroundings

17

detonation

an extremely rapid oxidation reaction accompanied by a violent disruptive effect and an intense, high-speed shock wave

18

low explosive

an explosive with a velocity of detonation less than 1000m/s

19

black powder

a mixture of potassium nitrate, carbon and sulfur in the ratio 75:15:10

20

safety fuse

a cord containing a core of black powder; used to carry a flame at a uniform rate to an explosive charge

21

smokeless powder (single base)

an explosive consisting of nitrocellulose

22

smokeless powder (double base)

an explosive consisting of a mixture of nitrocellulose and nitroglycerin

23

high explosive

an explosive with a velocity of detonation greater than 1000m/s

24

primary explosive

a high explosive that is easily detonated by heat, shock, or friction

25

secondary explosive

a high explosive that is relatively insensitive to heat, shock, or friction

26

detonating cord

a cord-like explosive containing a core of high-explosive material, usually PETN; also called primacord

27

to initiate and sustain combusion

1.fuel must be present
2.oxygen must be available
3.heat must be applied

28

signs of arson

separate unconnected fires, "streamers", severe burning found on the floor, presence of accelerants

29

gas chromatograph

detecting and characterizing flame residues

30

bomb site investigation

systematically searched to recover any trace of a detonating mechanism or any other item foreign to the explosion site

31

presence of crater

obvious characteristic of high or contained low explosive

32

packaging of bomb site evidence

air tight containers, such a clean paint cans