Firearm Unit . The firearm unit examines firearms, discharge bullets, cartridge cases, shotgun shells, and ammunition of all types. The basic principles of fireamrs examination are also applied here to the comparison of marks made by tools.
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Unit rate
A rate is a fraction that compares two quantities measured in different units. If the denominator of the fraction is 1 unit, the rate is called a unit rate.
conversion factor
Tape measure and centimetre.
The unit of mass in SI is kilogram (kg).