IEC TS 62720:2013

IEC/TS 62720 ®
Edition 1.0 2013-05
TECHNICAL
SPECIFICATION
SPÉCIFICATION
TECHNIQUE
Identification of units of measurement for computer-based processing

Identification des unités de mesure pour le traitement assisté par ordinateur

IEC/TS 62720:2013
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IEC/TS 62720 ®
Edition 1.0 2013-05
TECHNICAL
SPECIFICATION
SPÉCIFICATION
TECHNIQUE
Identification of units of measurement for computer-based processing

Identification des unités de mesure pour le traitement assisté par ordinateur

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XH
ICS 01.060; 35.240.50 ISBN 978-2-83220-823-6

– 2 – TS 62720  IEC:2013
CONTENTS
FOREWORD . 12
INTRODUCTION . 14
1 Scope . 15
2 Normative references . 15
3 Terms and definitions . 15
4 Relations between quantities, units and their systems . 21
4.1 General . 21
4.2 The International System of Quantities and the International System of Units . 21
4.3 Other systems of quantities and units . 23
4.4 Context of units, quantities, and systems of units . 23
5 SI prefixes and SI prefix symbols. 24
5.1 General . 24
5.2 Formation of multiples and factors to the base of 10 . 24
5.3 Formation of multiples to the base of 2 . 25
5.4 Usage of SI prefixes and SI prefix symbols . 25
5.4.1 General . 25
5.4.2 Combination of SI prefixes, SI prefix symbols, names of units and
symbols for units . 25
5.4.3 Use of power exponentials in conjunction with SI prefixes, SI prefix
symbols, names of units or symbols for units. . 26
5.4.4 Restrictions on combining SI prefixes, SI prefix symbols, names of
units and symbols for units . 26
5.5 Selecting SI prefixes and SI prefix symbols . 26
6 Data sources of units . 26
7 Identification of units . 27
Annex A (informative) Information about units . 28
Annex B (normative) Identifiers for units and quantities that are derived from the SI
system of units . 29
Annex C (normative) Identifiers for units and quantities that are not derived from the
SI system of units . 127
Annex D (normative) Identifiers for unit systems . 163
Annex E (informative) XML representation of units . 164
Bibliography . 260

Figure 1 – Overview about the relationships between the tables contained in the
annexes . 23
Figure 2 – International registration data identifier (IRDI), Source: ISO 11179-6:2005 . 27
Figure B.1 – Structure of table headers. 29
Figure C.1 – Structure of table headers . 127

Table 1 – Concepts for quantities. 16
Table 2 – Base quantity and base unit . 17
Table 3 – Base quantities . 19
Table 4 – Base quantities and base units in the International System of Units . 22
Table 5 – Representation of base quantities in the International System of Units [34] . 22

TS 62720  IEC:2013 – 3 –
Table 6 – Formation of multiples and factors of units to the base of 10 . 24
Table 7 – Formation of multiples of units to the base of 2 . 25
Table 8 – Units that are used without prefixes or prefix symbols . 26
Table B.1 – Absorbed dose . 29
Table B.2 – Absorbed dose rate . 30
Table B.3 – Acceleration . 30
Table B.4 – Active power . 31
Table B.5 – Amount of substance . 32
Table B.6 – Amount of substance concentration. 32
Table B.7 – Angular acceleration . 33
Table B.8 – Angular cross-section . 33
Table B.9 – Angular momentum . 33
Table B.10 – Angular velocity . 34
Table B.11 – Angular wave number . 34
Table B.12 – Apparent power . 34
Table B.13 – Areic bit density . 35
Table B.14 – Areic charge density . 35
Table B.15 – Areic mass . 36
Table B.16 – Avogadro constant . 36
Table B.17 – Bandwidth distance product . 36
Table B.18 – Battery capacity . 37
Table B.19 – Bit rate . 37
Table B.20 – Burst factor . 37
Table B.21 – Byte rate . 38
Table B.22 – Capacitance . 38
Table B.23 – Catalytic activity . 39
Table B.24 – Catalytic activity concentration . 39
Table B.25 – Celsius temperature . 40
Table B.26 – Compressibility . 40
Table B.27 – Conductivity . 40
Table B.28 – Cross-section . 41
Table B.29 – Dataset of bits . 41
Table B.30 – Dataset of bytes . 42
Table B.31 – Density .
...