ISO 80000-1:2009给出了有关数量、数量体系、单位、数量和单位符号以及连贯单位体系的一般信息和定义，尤其是国际数量体系ISQ和国际单位体系SI。 ISO 80000-1:2009中规定的原则适用于科学和技术的各个领域，并作为对数量和单位系列其他部分的介绍。 序数和标称特性不在ISO 80000-1:2009的范围内。

ISO 80000-1:2009 gives general information and definitions concerning quantities, systems of quantities, units, quantity and unit symbols, and coherent unit systems, especially the International System of Quantities, ISQ, and the International System of Units, SI. The principles laid down in ISO 80000-1:2009 are intended for general use within the various fields of science and technology and as an introduction to other parts of the Quantities and units series. Ordinal quantities and nominal properties are outside the scope of ISO 80000-1:2009.