What is the state of matter of glass at room temperature?
It is an amorphous solid.
The main compounds in glass are __________.
Silicon Oxides & Metal Oxides
What is the name of the glass that is made by passing the molten glass through rollers?
Ordinary or rolled glass
Window glass is (more/less) dense than water.
More dense
The two most important physical properties of glass used for identification are:
Density and refractive index
True or False Density is not homogeneous over sheet of glass
True
True or False, when glass shatters it is easy to reconstruct the original shape.
false
This type of glass involves a treatment where the glass is heated to 620 o C and then cooled rapidly. What is the name of this glass?
Tempered or Safety Glass
Name the type of glass that is used for flat glass, container glass, and electric light bulbs.
Soda Lime Silicate
The fracture pattern of glass usually has __________ lines.
Conchoidal
This type of conchoidal line appears first when glass is fractured.
Radial
For a ______________ fracture, the perpendicular end, faces the surface on which the force originated.
concentric
In a forensic laboratory, a technique frequently used to determine the density of glass involves the use of ___________
Density – Gradient tubes
Stress marks on the edge of a radial crack near the point of impact are ___________ to the side on which the force was applied.
parallel
True or False A crater-shaped hole is narrower on the side where the projectile entered the glass.
True
True or False – It is easy to determine from the size and shape of a hole in glass, whether to was made by a bullet or some other projectile.
False
A piece of window glass is submerged in vegetable oil. The outline of the glass is visible. When light is shown behind the glass, a bright halo appears near the border of the glass. This bright halo is called a _________.
Becke line
Laminate or laminated
Name at least one out of three common problems associated with glass analysis (glass comparisons)
Find and measure properties Associate one glass fragment with another Minimize or eliminate other sources
The bending of light as it travels through one medium into another is known as ________.
Refraction
As light goes from the air into a liquid sample, the bending of light is due to a(n) ___________ in velocity of the light.
decrease
At 25 o C the refractive index of water is This means that light travels 1.333x __________ in a vacuum than in water.
Faster