NEW INTERNATIONAL STANDARDS FOR QUANTITIES AND UNITS

Each coherent system of units is based on a system of quantities in su ch a way that the equations between the numerical values expressed in coherent units have exactly the same form, including numerical factors , as the corresponding equations between the quantities. The highest i nternational body responsible for the International System of Units (S I) is the Conference Generale des Poids et Mesures (CGPM). However, th e CGPM is not concerned with quantities or systems of quantities, That question lies within the scope of Technical Committee number twelve o f the International Organization for Standardization (ISO/TC 12), Quan tities, units, symbols, conversion factors. To fulfil its responsibili ty, ISO/TC 12 has prepared the International Standard ISO 31, Quantiti es and Units, which consists of fourteen parts. The new editions of th e different parts of the International Standard are briefly presented here.