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International System of Unit SI

  Excerpt from JIS Z 8203 (2000)

■ International unit system (SI) and its usage

1. Scope

This standard specifies how to use units in the International System of Units (SI) and international unit systems, as well as units used in conjunction with international unit systems and units that may be used together.


2. Terms and Definitions

The main terms used in this standard and their definitions shall be as follows.

(1) International System of Units (SI)

Consistent unit system adopted and recommended at the International Association of Measurement and Measurement. It consists of basic units, ancillary units and assembly units assembled from them and their integer multiplier of ten.
SI is an abbreviation for the international unit system.


(2) SI unit

A general term for basic units, auxiliary units and assembly units in the International Unit System (SI).
- Basic unit The one shown in Table 1 is the basic unit.
- Auxiliary unit The one shown in Table 2 shall be an auxiliary unit.
- Assembled Unit The unit represented by an algebraic method (using multiplicative / divisional mathematical symbols) using
  the basic unit and auxiliary unit is an assembly unit. Assembly units with unique names are given in Table 4.

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