what does it mean?
Conversion: You are changing from one unit to another, as in "convert 254 cm into m."Originally Posted by kate
Simple metric unit: Usually refers to a "base" unit; one that refers to a quantity of length, mass, time, or charge. Typical examples are the meter (m), kilogram (kg), seconds (s), and Coulombs (C). Different unit systems use different sets of base units.