BS-5775-0-1993 ISO-31-0-1992.pdf
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1、BRITISH STANDARD BS 5775-0: 1993 ISO 31-0:1992 Specification for Quantities, units and symbols Part 0: General principles UDC 389.15/.16:006.72 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 10:01:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5775-0:1993 This British Standard, having been
2、 prepared under the direction of the Systems Department Steering Committee, was published under the authority of the Standards Board and comes into effect on 15 July 1993 BSI 12-1999 First published February 1982 Second edition July 1993 The following BSI references relate to the work on this standa
3、rd: Committee reference S/1 Draft for comment 90/51778 DC ISBN 0 580 22194 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Systems Department Steering Committee (S/-) to Technical Committee S/1, upon which the following bodies were rep
4、resented: Chartered Institution of Building Services Engineers Department of Trade and Industry (National Physical Laboratory) Department of Trade and Industry (National Weights and Measures Laboratory) EEA (the Association of Electronics, Telecommunications and Business Equipment Industries) Instit
5、ute of Physics Institute of Trading Standards Administration Institution of Chemical Engineers Institution of Electrical Engineers Institution of Mechanical Engineers Institution of Structural Engineers Royal Society Royal Society of Chemistry Schools Mathematics Project Society of Chemical Industry
6、 Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 10:01:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5775-0:1993 BSI 12-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Quantities and units1 3
7、Recommendations for printing symbols and numbers7 Annex A (informative) Guide to terms used in names for physical quantities11 Annex B (informative) Guide to the rounding of numbers14 Annex C (informative) International organizations in the field of quantities and units15 Table 1 SI base units4 Tabl
8、e 2 SI derived units with special names, including SI supplementary units5 Table 3 SI derived units with special names admitted for reasons of safeguarding human health5 Table 4 SI prefixes6 Table 5 Units used with the SI7 Table 6 Units used with the SI, whose values in SI units are obtained experim
9、entally7 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 10:01:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5775-0:1993 ii BSI 12-1999 National foreword This Part of BS 5775 has been prepared under the direction of the Systems Department Steering Commit
10、tee. It is identical with ISO 31-0:1992 Quantities and units Part 0: General principles, published by the International Organization for Standardization (ISO). ISO 31-0 was prepared by Technical Committee ISO/TC 12 “Quantities, units, symbols, conversion factors” with the active participation and ap
11、proval of the UK. This Part of BS 5775 supersedes BS 5775-0:1982, which is withdrawn. The principal changes made in this revised version are as follows: a) new tables of SI base units, SI derived units, SI prefixes and some other recognized units have been added; b) a new subclause (2.3.3) on the un
12、it “one” has been added; c) a new Annex C on international organizations in the field of quantities and units has been added. BS 5775 comprises the following Parts, each of which is identical with the corresponding Part of ISO 31. Part 0: General principles; Part 1: Space and time; Part 2: Periodic
13、and related phenomena; Part 3: Mechanics; Part 4: Heat; Part 5: Electricity and magnetism; Part 6: Light and related electromagnetic radiations; Part 7: Acoustics; Part 8: Physical chemistry and molecular physics; Part 9: Atomic and nuclear physics; Part 10: Nuclear reactions and ionizing radiations
14、; Part 11: Mathematical signs and symbols for use in the physical sciences and technology; Part 12: Characteristic numbers; Part 13: Solid state physics. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their co
15、rrect application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-reference International StandardCorresponding British Standard ISO 2955:1983BS 6430:1983 Method for representing SI and other units in information processing systems with limited ch
16、aracter sets (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 18, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the am
17、endment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 10:01:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5775-0:1993 BSI 12-19991 1 Scope This part of ISO 31 gives general information about principles concerning physical quantities, equations, quantity a
18、nd unit symbols, and coherent unit systems, especially the International System of Units, SI. The principles laid down in this part of ISO 31 are intended for general use within the various fields of science and technology and as a general introduction to the other parts of ISO 31. 2 Quantities and
19、units 2.1 Physical quantity, unit and numerical value In ISO 31 only physical quantities used for the quantitative description of physical phenomena are treated. Conventional scales, such as the Beaufort scale, Richter scale and colour intensity scales, and quantities expressed as the results of con
20、ventional tests, e.g. corrosion resistance, are not treated here, neither are currencies nor information contents. Physical quantities may be grouped together into categories of quantities which are mutually comparable. Lengths, diameters, distances, heights, wavelengths and so on would constitute s
21、uch a category. Mutually comparable quantities are called “quantities of the same kind”. If a particular example of a quantity from such a category is chosen as a reference quantity called the unit, then any other quantity from this category can be expressed in terms of this unit, as a product of th
22、is unit and a number. This number is called the numerical value of the quantity expressed in this unit. EXAMPLE The wavelength of one of the sodium lines is = 5,896 107m Here is the symbol for the physical quantity wavelength; m is the symbol for the unit of length, the metre; and 5,896 107 is the n
23、umerical value of the wavelength expressed in metres. In formal treatments of quantities and units, this relation may be expressed in the form A = A A where A is the symbol for the physical quantity, A the symbol for the unit and A symbolizes the numerical value of the quantity A expressed in the un
24、it A. For vectors and tensors the components are quantities which may be expressed as described above. If a quantity is expressed in another unit which is k times the first unit, then the new numerical value becomes 1/k times the first numerical value; the physical quantity, which is the product of
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