Fire Definitions
This is defined as the combination of oxygen with other substances to produce new substances, an example is rusting.
What is oxidation?
The search of a fire scene must focus on finding this.
What is the origin of the fire?
These should be used to collect and preserve arson and explosive evidence.
What are metal cans?
Wear and tear patterns on a tire or sneaker, lead to these type of characteristics in impression evidence.
What are individual characteristics?
These type of markings on a bullet are individual characteristics that match the bullet to the firearm from which it was fired.
What are striations?
Fire is this type of reaction in which heat energy is given off.
What is exothermic?
These are the three ways in which heat is transferred.
What are conduction, radiation and convection?
A fire scene should be thoroughly searched for the use of accelerants and these items that start a fire.
What is an igniter?
When you cannot take the piece of evidence, this type of casting should be used with tool marks.
What is silicone?
This part of a bullet has marking of the firing pin after firing.
What is the casting?
This happens when a fire starts by a natural heat-producing process in the presence of sufficient air and fuel.
What is spontaneous combustion?
These are three signs that a fire was started by arson.
After an explosion, evidence collection should focus in this area.
What is the crater?
This type of casting is best for shoe prints or tire tracks in soft dirt.
What is a dental castings?
This database is used for the comparison of bullets found at a crime scene.
What is NIBIN?
This is the transfer of heat energy by the movement of molecules within a liquid or gas.
What is convection?
These are the most common type of low explosives.
What are black and smokeless powders?
This is another name for an uncontaminated control sample that should be collected at a fire scene.
What is an exemplar?
A criminalist should always do this before trying to collect an impression.
Primer residue analysis (or gunshot residue analysis) looks for the presence of these two elements.
What are barium and antimony?
This is the minimum temperature at which a liquid fuel produces enough vapor to burn.
What is flash point?
These type of high explosives are sensitive to heat, shock or friction.
What are primary explosives?
This instrument is the best for identifying accelerants used in starting a fire.
What is a GC/MS?
The suspect tool and the casting should always be packaged separately to prevent this from happening.
What is contaminating or damaging the evidence?
A forensic scientist in the ballistics section of a crime laboratory may be asked to perform analysis of the evidence in one of these four areas.
What are serial number restoration, bullet comparison, distance determination and gunshot residue analysis?