1、 IEC 80000-13Edition 1.0 2008-03INTERNATIONAL STANDARD NORME INTERNATIONALEQuantities and units Part 13: Information science and technology Grandeurs et units Partie 13: Science et technologies de linformation IEC80000-13:2008 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2008 IEC, Geneva, Switz
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16、 919 03 00 IEC 80000-13Edition 1.0 2008-03INTERNATIONAL STANDARD NORME INTERNATIONALEQuantities and units Part 13: Information science and technology Grandeurs et units Partie 13: Science et technologies de linformation INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIO
17、NALE TICS 01.040.35 PRICE CODECODE PRIXISBN 2-8318-9625-8 2 80000-13 IEC:2008 CONTENTS FOREWORD.3 INTRODUCTION.5 0.1 Arrangements of the tables .5 0.2 Tables of quantities .5 0.3 Tables of units.5 0.3.1 General .5 0.3.2 Remark on units for quantities of dimension one, or dimensionless quantities.6 0
18、.4 Numerical statements in this International Standard 6 1 Scope.9 2 Normative references .9 3 Names, definitions and symbols .9 4 Prefixes for binary multiples .24 Bibliography25 80000-13 IEC:2008 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ QUANTITIES AND UNITS Part 13: Information science and te
19、chnology FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardizati
20、on in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is en
21、trusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the Inte
22、rnational Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since
23、 each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content o
24、f IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in
25、 their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment de
26、clared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC Natio
27、nal Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is
28、 drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall
29、 not be held responsible for identifying any or all such patent rights. International Standard IEC 80000-13 has been prepared by IEC technical committee 25: Quantities and units, and their letter symbols. This standard cancels and replaces subclauses 3.8 and 3.9 of IEC 60027-2:2005. The only signifi
30、cant change is the addition of explicit definitions for some quantities. The text of this standard is based on the following documents: FDIS Report on voting 25/371/FDIS 25/377/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the
31、above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 4 80000-13 IEC:2008 IEC 80000 consists of the following parts, under the general title Quantities and units: Part 6: Electromagnetism Part 13: Information science and technology Part 14: Telebiometrics
32、related to human physiology The following parts are published by ISO: Part 1: General Part 2: Mathematical signs and symbols to be used in the natural sciences and technology Part 3: Space and time Part 4: Mechanics Part 5: Thermodynamics Part 7: Light Part 8: Acoustics Part 9: Physical chemistry an
33、d molecular physics Part 10: Atomic and nuclear physics Part 11: Characteristic numbers Part 12: Solid state physics The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in
34、the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 80000-13 IEC:2008 5 INTRODUCTION 0.1 Arrangements of the tables The tables of quantities and units in ISO/IEC 80000 are arranged so that the quantiti
35、es are presented on the left-hand pages and the units on the corresponding right-hand pages. All units between two full lines on the right-hand pages belong to the quantities between the corresponding full lines on the left-hand pages. Where the numbering of an item has been changed in the revision
36、of a part of IEC 60027, the number in the preceding edition is shown in parenthesis on the left-hand page under the new number for the quantity; a dash is used to indicate that the item in question did not appear in the preceding edition. 0.2 Tables of quantities The names in English and in French o
37、f the most important quantities within the field of this document are given together with their symbols and, in most cases, their definitions. These names and symbols are recommendations. The definitions are given for identification of the quantities in the International System of Quantities (ISQ),
38、listed on the left hand pages of Table 1; they are not intended to be complete. The scalar, vectorial or tensorial character of quantities is pointed out, especially when this is needed for the definitions. In most cases only one name and only one symbol for the quantity are given; where two or more
39、 names or two or more symbols are given for one quantity and no special distinction is made, they are on an equal footing. When two types of italic letters exist (for example as with and ; and ; a and a; g and g) only one of these is given. This does not mean that the other is not equally acceptable
40、. It is recommended that such variants should not be given different meanings. A symbol within parenthesis implies that it is a reserve symbol, to be used when, in a particular context, the main symbol is in use with a different meaning. In this English edition the quantity names in French are print
41、ed in an italic font, and are preceded by fr. The gender of the French name is indicated by (m) for masculine and (f) for feminine, immediately after the noun in the French name. 0.3 Tables of units 0.3.1 General The names of units for the corresponding quantities are given together with the interna
42、tional symbols and the definitions. These unit names are language-dependent, but the symbols are international and the same in all languages. For further information, see the SI Brochure (8thedition 2006) from BIPM and ISO 80000-1 (under preparation). The units are arranged in the following way: a)
43、The coherent SI units are given first. The SI units have been adopted by the General Conference on Weights and Measures (Confrence Gnrale des Poids et Mesures, CGPM). The use of coherent SI units, and their decimal multiples and submultiples formed with the SI prefixes are recommended, although the
44、decimal multiples and submultiples are not explicitly mentioned. b) Some non-SI units are then given, being those accepted by the International Committee for Weights and Measures (Comit International des Poids et Mesures, CIPM), or by the International Organization of Legal Metrology (Organisation I
45、nternationale de Mtrologie Lgale, OIML), or by ISO and IEC, for use with the SI. 6 80000-13 IEC:2008 Such units are separated from the SI units in the item by use of a broken line between the SI units and the other units. c) Non-SI units currently accepted by the CIPM for use with the SI are given i
46、n small print (smaller than the text size) in the “Conversion factors and remarks” column. d) Non-SI units that are not recommended are given only in annexes in some parts of ISO/IEC 80000. These annexes are informative, in the first place for the conversion factors, and are not integral parts of th
47、e standard. These deprecated units are arranged in two groups: 1) units in the CGS system with special names; 2) units based on the foot, pound, second, and some other related units. e) Other non-SI units given for information, especially regarding the conversion factors, are given in another inform
48、ative annex. 0.3.2 Remark on units for quantities of dimension one, or dimensionless quantities The coherent unit for any quantity of dimension one, also called a dimensionless quantity, is the number one, symbol 1. When the value of such a quantity is expressed, the unit symbol 1 is generally not w
49、ritten out explicitly. EXAMPLE Refractive index n = 1,53 1 = 1,53 Prefixes shall not be used to form multiples or submultiples of this unit. Instead of prefixes, powers of 10 are recommended. EXAMPLE Reynolds number Re = 1,32 103Considering that plane angle is generally expressed as the ratio of two lengths and solid angle as the ratio of two areas, in 1995 the CGPM specified that, in the SI, the radian, symbol rad, and sterad
