A system of units is a class of units defined by composition from a base set of units, such that every instance of the class is “standard” unit for a physical dimension and every physical dimension has an associated unit. A measurement of any physical quantity must be expressed as a number followed by a unit...
A system of units is a class of units defined by composition from a base set of units, such that every instance of the class is “standard” unit for a physical dimension and every physical dimension has an associated unit. A measurement of any physical quantity must be expressed as a number followed by a unit...