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Terminology: Chemistry

Accelerant

Any fuel that is used to start, spread, or increase the intensity of a fire.

Combustion

A fast, exothermic oxidation reaction that occurs between a fuel and oxygen, generating heat and light. this reaction is slower than explosive reactions.

Deflagration

Rapid combustion that has a reaction rate slower than the speed of sound.

Detonation

Decomposition of an explosive that has a reaction rate faster than the speed of sound.

Explosion

A rapid release of energy and pressure that is accompanied with the production of heat, sound, and light.

Exothermic

Release of heat into the environment.

Fire

Rapid oxidation of a fuel with the production of heat and light.

Fourier Transform Infrared Spectroscopy (FTIR)

An analytical technique that is used to develop theĀ absorption or emission pattern in the infrared spectrum of the chemical components of evidence to identify them using a database of standards.

Gas Chromatography – Mass Spectrometry (GC-MS)

An analytical chemistry technique used to analyze and identify the components of a gaseous sample extracted from the headspace of a glass container containing solid or liquid evidence

Headspace

The air space that is present above and around a contained sample that is in a glass container.

Liquid Chromatography – Mass Spectrometry (LC-MS)

An analytical chemistry technique used to analyze and identify the components of an aqueous sample.

Oxidation

The chemical process by which an element or compound combines with oxygen.

Scanning Electron Microscope – Energy Dispersive X-Ray (SEM-EDX)

An analytical device that uses X-rays to magnify the surface morphology of microscopic material and to determine the elemental makeup of the evidence.

Volatile

A chemical property that characterizes the ability of a materials to enter gas phase spontaneously at room temperatures.

X-Ray Diffraction (XRD)

An analytical technique that uses X-rays to determine the crystalline structure of the evidence.

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