Quantities and units - Part 8: Acoustics (ISO 80000-8:2007)

ISO 80000-8 gives names, symbols and definitions for quantities and units of acoustics. Where appropriate, conversion factors are also given.

Größen und Einheiten - Teil 8: Akustik (ISO 80000-8:2007)

ISO 80000-8 enthält Namen, Zeichen und Definitionen für Größen und Einheiten der Akustik. Wo benötigt, sind auch Umrechnungsfaktoren aufgeführt.

Grandeurs et unités - Partie 8: Acoustique (ISO 80000-8:2007)

L'ISO 80000-8:2007 donne les noms, les symboles et les définitions des grandeurs et des unités d'acoustique. Des facteurs de conversion sont également indiqués, s'il y a lieu.

Veličine in enote - 8. del: Akustika (ISO 80000-8:2007)

General Information

Publication Date
Withdrawal Date
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
Due Date
Completion Date


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SIST EN ISO 80000-8:2007
Quantities and units - Part 8: Acoustics (ISO 80000-8:2007)
Größen und Einheiten - Teil 8: Akustik (ISO 80000-8:2007)
Grandeurs et unités - Partie 8: Acoustique (ISO 80000-8:2007)
Ta slovenski standard je istoveten z: EN ISO 80000-8:2007
01.060 9HOLþLQHLQHQRWH Quantities and units
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
SIST EN ISO 80000-8:2007 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EN ISO 80000-8
June 2007
ICS 01.060

English Version
Quantities and units - Part 8: Acoustics (ISO 80000-8:2007)
Grandeurs et unités - Partie 8: Acoustique (ISO 80000- Größen und Einheiten - Teil 8: Akustik (ISO 80000-8:2007)
This European Standard was approved by CEN on 3 May 2007.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 80000-8:2007: E
worldwide for CEN national Members.

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EN ISO 80000-8:2007 (E)


This document (EN ISO 80000-8:2007) has been prepared by Technical Committee ISO/TC 12
"Quantities, units, symbols, conversion factors" in collaboration with Technical Committee
CEN/TC 211 "Acoustics", the secretariat of which is held by DS.

This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by December 2007, and conflicting national
standards shall be withdrawn at the latest by December 2007.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United

Endorsement notice

The text of ISO 80000-8:2007 has been approved by CEN as EN ISO 80000-8:2007 without any


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STANDARD 80000-8
First edition
Corrected version
Quantities and units —
Part 8:
Grandeurs et unités —
Partie 8: Acoustique

Reference number
ISO 80000-8:2007(E)
ISO 2007

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ISO 80000-8:2007(E)
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ii ISO 2007 – All rights reserved

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ISO 80000-8:2007(E)
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 80000-8 was prepared by Technical Committee ISO/TC 12, Quantities, units, symbols, conversion factors,
in collaboration with IEC/TC 25, Quantities and units, and their letter symbols.
This first edition cancels and replaces the second edition of ISO 31-7:1992 and ISO 31-7:1992/Amd.1:1998.
The major technical changes from the previous standards are the following:
— the presentation of numerical statements has been changed;
—the special remarks in the Introduction have been changed;
—the normative references have been changed;
— some quantities have been added to the list of quantities and some quantities have been deleted.
This corrected version of ISO 80000-8:2007 incorporates the following corrections.
— 0.3.1 e) The sentence was reworded.
— 8-3.b In the definition, the sign “=” was replaced by the sign “:=” after “dec”.
— 8-18 In the definition and in the remarks, the subscript “f” was deleted.
In the definition, “frequency-weighted” was deleted.
— 8-22 In the definition and in the remarks, the subscript “ft” was deleted.
In the definition, “frequency- and time-weighted” was deleted.
In the remarks, “, or both” was added at the end of the first line.
In the remarks, “and/or specific frequency bands” was changed to “or specific frequency bands or
both” in the second line.
— 8-23 In the definition, “is” was added after “reference value”.
— 8-24 In the definition, “is” was added after “reference value”.
ISO 80000 consists of the following parts, under the general title Quantities and units:
— 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
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ISO 80000-8:2007(E)
— Part 5: Thermodynamics
— Part 7: Light
— Part 8: Acoustics
— Part 9: Physical chemistry and molecular physics
— Part 10: Atomic and nuclear physics
— Part 11: Characteristic numbers
— Part 12: Solid state physics
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 related to human physiology
iv ISO 2007 – All rights reserved

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ISO 80000-8:2007(E)
0.1 Arrangements of the tables
The tables of quantities and units in this International Standard are arranged so that the quantities 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 of a part of ISO 31, the number in the
preceding edition is shown in parentheses 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 of the most important quantities within the field of this International
Standard 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), listed on the left hand pages of the table; 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
In most cases only one name and only one symbol for the quantity are given; where two or more 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 ϑ and θ; ϕ and φ; a and a; g and g) only one of these
is given. This does not mean that the other is not equally acceptable. It is not recommended to give such
variants different meanings. A symbol within parentheses 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 printed 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 international symbols and the
definitions. These unit names are language-dependent, but the symbols are international and the same in all
th 1)
languages. For further information, see the SI Brochure (8 edition 2006) from BIPM and ISO 80000-1 .
The units are arranged in the following way:
a) The coherent SI units are given first. The SI units have been adopted by the General Conference on
Weights and Measures (Conférence Générale des Poids et Mesures, CGPM). The use of coherent SI units
1) To be published.
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ISO 80000-8:2007(E)
is recommended; decimal multiples and submultiples formed with the SI prefixes are recommended, even
though not explicitly mentioned.
b) Some non-SI units are then given, being those accepted by the International Committee for Weights and
Measures (Comité International des Poids et Mesures, CIPM), or by the International Organization of Legal
Metrology (Organisation Internationale de Métrologie Légale, OIML), or by ISO and IEC, for use with the SI.
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 in 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 this International
Standard. These annexes are informative, in the first place for the conversion factors, and are not integral
parts of the 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 are given for information, especially regarding the conversion factors, in informative
annexes in some parts of this International Standard.
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 written out
EXAMPLE 1 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
EXAMPLE 2 Reynolds number Re = 1,32× 10
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 specified that, in the SI, the radian, symbol rad, and steradian, symbol sr, are
dimensionless derived units. This implies that the quantities plane angle and solid angle are considered as
derived quantities of dimension one. The units radian and steradian are thus equal to one; they may either be
omitted, or they may be used in expressions for derived units to facilitate distinction between quantities of
different kinds but having the same dimension.
0.4 Numerical statements in this International Standard
The sign = is used to denote “is exactly equal to”, the sign ≈ is used to denote “is approximately equal to”, and
the sign := is used to denote “is by definition equal to”.
Numerical values of physical quantities that have been experimentally determined always have an associated
measurement uncertainty. This uncertainty should always be specified. In this International Standard, the
magnitude of the uncertainty is represented as in the following example.
EXAMPLE l = 2,347 82(32) m
In this example, l = a(b) m, the numerical value of the uncertainty b indicated in parentheses is assumed to
apply to the last (and least significant) digits of the numerical value a of the length l. This notation is used when
b represents the standard uncertainty (estimated standard deviation) in the last digits of a. The numerical
example given above may be interpreted to mean that the best estimate of the numerical value of the length l
(when l is expressed in the unit metre) is 2,347 82, and that the unknown value of l is believed to lie between
(2,347 82− 0,000 32) m and (2,347 82 + 0,000 32) m, with a probability determined by the standard
uncertainty 0,000 32 m and the normal probability distribution of the values of l.
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ISO 80000-8:2007(E)
0.5 Special remarks
0.5.1 General
In the explanations in the “Definition” column for quantities, it is assumed that systems are linear and that non-
linear effects and effects due to anisotropy and superimposed f

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