The projects focus on the two elemental analysis techniques X-Ray Fluorescence (XRF) and Laser Ablation Inductively Coupled Mass Spectrometry (LA-ICP-MS) that are commonly used by forensic glass analysts.
- What methods are used to analyze glass?
- What are the methods used for the matching of glass evidence?
- What are two ways to physically analyze glass?
- What are the three ways glass evidence is analyzed?
- What physical properties are used most often to characterize glass particles?
- What is glass analysis?
- What are the two most important physical properties of glass for forensic comparison?
- What are the two types of glass?
- What is the flotation method used for when analyzing glass in forensics?
- Which method is best for determining the origin of glass fragments?
- Which of the following is the most common type of glass?
- How many types of glass are there?
- How you will analyze the density of glass samples?
- What are 3 characteristics of glass?
- What are two types of glass fractures?
- What is Glass-Analysis for decoding?
- How do you analyze glass fragments?
- What is the only method that can produce individualized glass evidence?
- What is the immersion method in forensics?
- What type of glass is strengthened by introducing stress?
- What are the different types of glass and their uses?
- What is glass explain its types and uses in detail?
- What is glass used?
- What are the two most important physical properties of glass for forensic comparisons quizlet?
- Where is tempered glass used forensics?
- What are chemical properties of glass?
- What two substances are added to silica as glass is made?
- What are glass fragments?
- Which of the following is a source of glass?
What methods are used to analyze glass?
Many methods have been used for compositional analysis of glass. These methods include semiquantitative techniques such as scanning electron microscopy-energy dispersive spectrometry (Ryland 1986; Terry et al. 1982) and X-ray fluorescence (Andrasko and Maehly 1978; Reeve et al.
What are the methods used for the matching of glass evidence?
Forensic glass samples can be analyzed by comparing the refractive index of the sample to that of the possible source. Examination of samples under a regular microscope or a scanning electron microscope can give detailed information about the sample’s physical and chemical characteristics.
What are two ways to physically analyze glass?
To compare glass fragments, a forensic scientist evaluates two important physical properties: density and refractive index.
What are the three ways glass evidence is analyzed?
There are three possible goals of forensic glass examination: classification, discrimination, and individualization.
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What physical properties are used most often to characterize glass particles?
What physical properties are used most often to characterize glass particles? Density and refractive index are used.
What is glass analysis?
Glass analysis includes determining the type of glass based on glass fragments. … Basic properties, such as color, thickness, and curvature, can also help to identify different samples of glass just by looking at them. Optical properties, such as refractive index (RI), are defined by various manufacturing methods.
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What are the two most important physical properties of glass for forensic comparison?
To compare glass fragments, a forensic scientist evaluates two important physical properties: density and refractive index.
What are the two types of glass?
- Annealed Glass. Annealed glass is a basic product formed from the annealing stage of the float process. …
- Heat Strengthened Glass. Heat Strengthened Glass is semi tempered or semi toughened glass. …
- Tempered or Toughened Glass. …
- Laminated Glass.
Is ultraviolet light is often used to examine physical properties of glass?
Ultraviolet light is often used to examine physical properties of glass. … The flotation method for determining the density of glass is more accurate than finding its mass and volume separately. 3. Some glass is less dense than water.
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What is the flotation method used for when analyzing glass in forensics?
One method is to measure the density of glass through the flotation method. In the flotation method a glass fragment will either float in a liquid of greater density, sink in a liquid of lower density, or remain suspended in a liquid of equal density.
Which method is best for determining the origin of glass fragments?
The flotation and immersion methods are best used to determine a glass fragment’s density and refractive index, respectively.
Which of the following is the most common type of glass?
Soda-lime glass is the most common (90% of glass made), and least expensive form of glass. It usually contains 60-75% silica, 12-18% soda, 5-12% lime.
How many types of glass are there?
soda-lime glass, lead glass and borosilicate glass. These three types of glass make up around 95 percent of the cullet glass used in the production process. The remaining 5 percent of glass is special-purpose glass.
How you will analyze the density of glass samples?
The density of an unknown sample of glass is determined by placing a glass sample into suspension in a liquid solution. The density of that liquid is then either measured directly or used comparatively with another sample of glass.
What are 3 characteristics of glass?
- Hardness and Brittleness. It is a hard material as it has great impact resistance against applied load. …
- Weather Resistance. …
- Insulation. …
- Chemical Resistance. …
- Colour and Shape Varieties. …
- Transparency. …
- Fire Resistant Glazing. …
- Property Modification.
What are two types of glass fractures?
When a projectile i.e. a bullet or rock hits the glass, it will form two distinct types of fractures: Radial and Concentric. There is another terminology that is known as cone fracture, observed to be caused by a penetration of the high velocity projectile such as a bullet.
What is Glass-Analysis for decoding?
In the Glass-Analysis approach, the immediate task is to match printed symbols to their appropriate sounds. Students then recognize the meaning that the printed word represents. The program offers immediate reinforcement and communicates to the learner which responses are effective and will be successful in decoding.
How do you analyze glass fragments?
By determining the thickness, refractive index, and density of the glass collected, glass fragments can be matched assuming a large enough piece can be recovered. 24. ANALYZING GLASS FRACTURES • Glass breaks in a characteristic manner which indicates the direction of travel of the impacting object.
What is the only method that can produce individualized glass evidence?
What is the only way to individualize glass fragments found at a crime scene to a single source? The only way to individualize glass fragments is to piece them together like a jigsaw puzzle.
What is the immersion method in forensics?
In the immersion method a glass sample is added to a pure liquid or liquid mixture of known refractive index. If the glass and liquid have different refractive indices, a colored boundary can be seen with the unaided eye.
What type of glass is strengthened by introducing stress?
Glass that is made stronger than ordinary window glass by introducing stress through rapid heating and cooling of the glass surface is called: plasticized glass.
What are the different types of glass and their uses?
- Float glass.
- Shatterproof glass.
- Laminated glass.
- Extra clean glass.
- Chromatic glass.
- Tinted glass.
- Toughened glass.
- Glass blocks.
What is glass explain its types and uses in detail?
GlassesCompositionUsesCrown GlassPotassium Oxide, Barium Oxide and SilicaIn making lenses of eyes glass.Lead crystal glassPotassium Carbonate, lead Oxide and SilicaIn making costly glass containers or vessels etc.
What is glass used?
Glass is used in the following non-exhaustive list of products: Packaging (jars for food, bottles for drinks, flacon for cosmetics and pharmaceuticals) Tableware (drinking glasses, plate, cups, bowls) Housing and buildings (windows, facades, conservatory, insulation, reinforcement structures)
What are the two most important physical properties of glass for forensic comparisons quizlet?
The two most important physical properties of glass for forensic comparisons are: Refractive index and density. The use of the Celsius temperature scale by scientists is ________ their use of the Fahrenheit temperature scale.
Where is tempered glass used forensics?
Tempered glass is used in: The side and rear windows of autos manufactured in the US. A piece of glass is immersed in a liquid. It proceeds to float on the liquid’s surface.
What are chemical properties of glass?
There is no single chemical composition that characterizes all glass. Typical glass contains formers, fluxes, and stabilizers. Formers make up the largest percentage of the mixture to be melted. In typical soda-lime-silica glass the former is silica (Silicon dioxide) in the form of sand.
What two substances are added to silica as glass is made?
What two substances are added to silica as glass is made? sodium carbonate and calcium oxide 3. What does the term “amorphous” mean? molecules arranged in a random fashion, much like those of a liquid 4.
What are glass fragments?
Glass fragments are pieces of larger glass items that cannot be identified, or are less than 50% of the original item. If glass fragments have been in the environment for long periods of time, they may become weathered and the edges may smooth out and they may have a frosty appearance (e.g. sea glass).
Which of the following is a source of glass?
Believe it or not, glass is made from liquid sand. You can make glass by heating ordinary sand (which is mostly made of silicon dioxide) until it melts and turns into a liquid. You won’t find that happening on your local beach: sand melts at the incredibly high temperature of 1700°C (3090°F).
