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ISO 80000-1:2009 is a standard describing scientific and mathematical quantities and their units. The standard, whose full name is Quantities and units Part 1: General was developed by the "International Organization for Standardization (ISO), superseding "ISO 31-0.[1] It provides general information concerning quantities and units and their symbols, especially the "International System of Quantities and the "International System of Units, and defines these quantities and units. It is a part of a group of standards called "ISO/IEC 80000.


Contents list[edit]

The standard is divided into the following chapters:

  1. Scope
  2. Normative references
  3. Terms and definitions
  4. Quantities
  5. Dimensions
  6. Units
  7. Printing rules


ISO 80000-1 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."

Terms and definitions[edit]

The standard includes the following definitions.


International System of Quantities (ISQ)[edit]

The special choice of base quantities and quantity equations, including multipliers, given in ISO 80000 and IEC 80000 defines the International System of Quantities, denoted “ISQ” in all languages. Derived quantities can be defined in terms of the base units by quantity equations. There are seven base quantities in the ISQ: length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity.



Section 6.5 of the standard describes the "International System of Units including "SI prefixes and IEC "binary prefixes "kibi- to "yobi-.

Printing rules[edit]

Section 7.3.2 states that the decimal mark is either a comma or a point on the line and further states that whichever decimal mark is used, that same mark should be consistently used.[2] This is in agreement with prior ISO standards and revisions, notably resolution 10 of the 22nd CGPM, 2003.[3]

Annex A (normative) – Terms in names for physical quantities[edit]

According to Annex A, "[t]he logarithm of the ratio of a quantity, Q, and a reference value of that quantity, Q0, is called a level". For example LP = "ln(P/P0) is the "level of a power quantity P.

Annex B (normative) – "Rounding of numbers[edit]

Annex C (normative) – Logarithmic quantities and their units[edit]

Annex C introduces the concepts of power quantities and root-power quantities, and deprecates field quantity.

Annex D (informative) – International organizations in the field of quantities and units[edit]


  1. ^ "ISO 80000-1:2009". "International Organization for Standardization. Retrieved 20 July 2013. 
  2. ^ "ISO 80000-1:2009 - Quantities and units -- Part 1: General". www.iso.org. Retrieved 3 April 2018. 
  3. ^ "BIPM - Resolutions of the 22nd CGPM". www.bipm.org. Retrieved 3 April 2018. 
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