Catalogue - Technical Informations - NBK

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International System of Units

Int

Excerpts from JIS Z 8203

1. Scope of application _This standard specifies how to use the International System of Units (SI) and other international unitary systems, as

well as units used in correlation with units from international systems, and other units which may be used.

2. Normative Reference The following standards have been prescribed by SI. They adhere to the latest revisions of International System of

Units.

IEC 27-1:1971 Letter symbols to be used in electrical technology-Parti :General

3. SI Units The name The International System of Units and its official abbreviation SI were adopted at the 11th General

Conference on Weights and Measures (CGPM) in 1960"

This system of measurements consists of the following units, it is a system of consistency.

- Base Units

- Derived Units

3.1 Base Units The International System of Units is based on the 7 base units indicated in table 1.

Table 1. Base Units

Table 3. Names of units recognized to protect people's health


Base Quantity	Derived Units
Base Quantity	Unit	Symbol	Expression in terms of Base Unit, Supplementary Unit or other SI Units
Radioactivity	Becquerel	Bq	1 Bq=1 s-1
Pull-in Doses	Gray	Gy	1 Gy=1 J/kg
Radio Equivalent	Sievert	Sv	1 Sv=1 J/kg

Table 4. Prefixes

Table 2. SI Derived Units with Special Names and Symbols


Base Quantity	Derived Units
Base Quantity	Unit	Symbol	Expression in terms of Base Unit, Supplementary Unit or other SI Units
Plane Angle	Radian	rad	1rad=1m/m=1
Solid Angle	Steradian	sr	1sr=1m2/m2=1
Frequency	Hertz	Hz	1 Hz=1 s-1
Force	Newton	N	1 N=1 kg-m/s²
Pressure, Stress	Pascal	Pa	1 Pa=1 N/m2
Energy, Work, Heat	Joule	J	1 J=1 N-m
Work Rate, Process Rate, Power, Electric Power	Watt	W	1 W=1 J/s
Electric Charge, Quantity of Electricity	Coulomb	C	1 C=1 A-s
Potential, Potential Difference, Voltage, Electromotive Force Inductance	Bol ts	V	1 V=1 W/A
Electrostatic Capacity, Capacitance	Farad	F	1 F=1 C/V
Electric Resistance	Ohm	Q	1 0=1 V/A
Conductance	Siemens	S	1 S=1 Q-1
Magnetic Flux	Weber	Wb	1 Wb=1 V-s
Magnetic Flux Density, Magnetic Induction	Tel s a	T	1 T=1 Wb/m2
Inductance	Henry	H	1 H=1 Wb/A
Celsius Temperature	Celsius Degree or Degree*	°c	t^t-273.15 K
Light Flux	Lumen	Im	1 lm=1 cd-sr
Illumination	Lux	Ix	1 Ix=11m/m2

* Celsius Degree is used for indicating Celsius temperature which is the substitute unit for Kelvin(K).

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