BS-ISO-31-7-1992.pdf
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1、BRITISH STANDARD BS ISO 31-7:1992 Quantities and units Part 7: Acoustics ICS 01.060 ? Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 25 13:02:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 31-7:1992 This British Standard was published under the authority of the Standards Policy and Strate
2、gy Committee on 16 July 2004 BSI 16 July 2004 ISBN 0 580 44075 3 National foreword This British Standard reproduces verbatim ISO 31-7:1992, including amendment 1:1998, and implements it as the UK national standard. It supersedes BS 5775-7:1993 which is withdrawn. The UK participation in its preparat
3、ion was entrusted to Technical Committee SS/7, General metrology, quantities, units and symbols, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international pu
4、blications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the
5、necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the
6、interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to vi, pages 1 to 11 and a b
7、ack cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 25 13:02:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 317:1992 Licensed Co
8、py: sheffieldun sheffieldun, na, Sat Nov 25 13:02:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 317:1992 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 25 13:02:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 317:1992 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 25 13:02:57 G
9、MT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 317:1992 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 25 13:02:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 0.3.2 Remark on units for quantities of dimension one The coherent unit for any quantity of dimension one is the number one, symbol 1.
10、When the value of such a quantity is expressed, the unit symbol 1 is generally not written 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 may be used. EXAMPLE Reynolds number Re =
11、 1,32 103 Considering 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 has specified that, in the International System of Units, the radian, rad, and the steradian, sr, are “dimensionless” derived units. This implies that
12、 the quantities plane angle and solid angle are considered as derived quantities of dimension one. The units radian and steradian may be omitted, or they may be used in expressions for derived units to facilitate distinction between quantities of different nature but having the same dimension. BS IS
13、O 317:1992 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 25 13:02:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 317:1992 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 25 13:02:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 317:1992 Licensed Copy: sheffieldun sheffieldun, na,
14、 Sat Nov 25 13:02:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 317:1992 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 25 13:02:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 317:1992 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 25 13:02:57 GMT+00:00 2006, Uncontrolled Copy
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