The two most important physical properties of glass for forensic comparisons are:

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Refractive index and density are the two most important physical properties of glass for forensic comparisons. Refractive index measures how much light is bent, or refracted, as it passes through a material, and density is the mass per unit volume of the glass. These two properties are very specific to each type of glass and can be used to match different fragments of glass found at a crime scene to a source, such as a specific type of window or vehicle.

The Two Most Important Physical Properties of Glass for Forensic