| Definition: | quantity represented by a single scalar (1) which depends on the choice of a unit of measurement or on a reference to a measurement procedure NOTE 1 The concept of "quantity" is defined in IEC 60050-111 and in the International Vocabulary of Basic and General Terms in Metrology (VIM). NOTE 2 In the usual three-dimensional space, a scalar quantity is independent of direction (102-03-12) and of the choice of the coordinate frame. Examples are: mass, electric charge, thermodynamic temperature, Rockwell C hardness, Engler viscosity for transformer oil. NOTE 3 The concept of absolute value applies to real scalar quantities, the concepts of real part, imaginary part, modulus and argument apply to complex scalar quantities, and the concept of square root applies to both.
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