Glass Forensics Vocabulary Flashcards Preview

jeremy harmon > Glass Forensics Vocabulary > Flashcards

Flashcards in Glass Forensics Vocabulary Deck (26):
1

Becke line

Line created as refracted light becomes concentrated around the edges of the glass fragments

2

Density

The ratio of the mass of an object to its volume

3

Glass

A hard, amorphous, transparent material made by heating a mixture of sand and other additives

4

Leaded glass

Glass containing lead oxide

5

Obsidian

Volcanic glass

6

Refraction

The change in the direction of light as it changes speeds when moving from one substance to another

7

Refractive index

A measure of how light bends as it passes from one substance to another

8

Silicon Dioxide

The chemical name for silica

9

Amorphous

Without shaper or form

10

What 2 things that make glass different

The additives or the way it is manufactured to break

11

What is glass made out of

Silicon dioxide, soda lime and calcium oxide

12

How does glass have individual characteristics? Give an example

If the glass has blood or fingerprints on it

13

How does glass have class characteristics? Give an example

If you can tell what type of glass it is

14

Amorphous solid

A solid with molecules randomly arranged

15

What is a conchoidal fracture?

The curved fracture lines on the edge of radial or concentric cracks

16

What can conchoidal cracks help determine

Help determine which side of the glass the impact came from

17

What is the 3 R rule

Radial, right, reverse

18

What are 2 ways you can determine the direction of a bullet entering through glass?

-Using the 3 R rule on a piece of broken glass with a radial fracture edge
-or look at the hole left by the projectile

19

What are radial fractures

Fractures that radiate out from the central hole

20

What are concentric fractures

Fractures that form circles

21

What can radial fractures help determine

Order of hits and which side the glass is impacted

22

Where is the laminated glass found and what's one property?

Windshield of car
Piece of plastic between 2 pieces of glass

23

Where is the lead crystal glass found and what's one property?

Found in crystal glassware, or decorative glass art
-includes PbO to give it shine and weight

24

Where is the Pyrex glass found and what's one property?

Baking pans, headlights
- resistant to rapid heat change

25

Where is the tempered glass found and what's one property?

Cutting boards, car windows
- breaks into squares

26

Where is the soda lime glass found and what's one property?

Windows, bottles
- can be recycled easily

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