ASTM C634-10a

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Designation:C634–10 Designation:C634–10a
Standard Terminology Relating to
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Building and Environmental Acoustics
This standard is issued under the fixed designation C634; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
In some of the entries, those that are measures of physical quantities, the term is followed by three
items: symbol, dimensions, and unit. The symbol, in italics, stands for the magnitude of the quantity
in mathematical expressions. The dimensions of a quantity express its measure in terms of three
fundamental quantities: M for mass, L for length, and T for time. Speed, for instance, is the quotient
obtained when the distance an object moves is divided by the time involved. The dimensions are
−1
[LT ], the negative exponent indicating division. The unit is consistently in SI, Le Système
Internationald’Unités.Thosestillusingthecgs(centimetre-gram-second)ortheinchpoundsystemof
units are referred for most of the conversion factors to IEEE/ASTM SI 10.Afew conversion factors
are listed in Section 4 of this terminology.
Thedimensionsofaquantityarethesameregardlessoftheunitsinwhichthequantityismeasured.
−1
Speed has the dimensions [LT ] whether it is measured in miles per hour, feet per second, or metres
per second. Quantities with different dimensions are not the same. Flow resistance and specific flow
resistance, for instance, are quantities of different kinds even though the names are similar. On the
other hand, quantities with the same dimensions are not necessarily of the same kind. Sound energy
−1 −2
density, for instance, has the same dimensions as sound pressure, [ML T ], but it is not a kind of
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sound pressure. Nor is absorption with the dimensions [L ] a kind of area.
1. Scope
1.1 This terminology covers terms and definitions related to environmental acoustics. Only definitions common to two or more
standardsunderthejurisdictionofCommitteeE33arelistedhere.Thepurposeofthisterminologyistopromoteuniformityofkey
definitions. Definitions pertinent to only one standard and exceptions to the definitions listed below are contained in the individual
standards and should be used when following those standards.
2. Referenced Documents
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2.1 ASTM Standards:
C423 Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
C367 Test Methods for Strength Properties of Prefabricated Architectural Acoustical Tile or Lay-In Ceiling Panels
C384 Test Method for Impedance and Absorption of Acoustical Materials by Impedance Tube Method
C522 Test Method for Airflow Resistance of Acoustical Materials
C635 SpecificationfortheManufacture,Performance,andTestingofMetalSuspensionSystemsforAcousticalTileandLay-in
Panel Ceilings
C636 Practice for Installation of Metal Ceiling Suspension Systems for Acoustical Tile and Lay-In Panels
C667 Specification for Prefabricated Reflective Insulation Systems for Equipment and Pipe Operating at Temperatures above
Ambient Air
C871 Test Methods for Chemical Analysis of Thermal Insulation Materials for Leachable Chloride, Fluoride, Silicate, and
Sodium Ions
E90 Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements
E336 Test Method for Measurement of Airborne Sound Attenuation between Rooms in Buildings
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This terminology is under the jurisdiction ofASTM Committee E33 on Building and EnvironmentalAcoustics and is the direct responsibility of Subcommittee E33.07
on Definitions and Editorial.
CurrenteditionapprovedJuneSept.1,2010.PublishedJulyDecember2010.Originallyapprovedin1969.Lastpreviouseditionapprovedin20092010asC634–109.DOI:
10.1520/C0634-10A.
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ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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C634–10a
E413 Classification for Rating Sound Insulation
E477 Test Method for Measuring Acoustical and Airflow Performance of Duct Liner Materials and Prefabricated Silencers
E492 Test Method for Laboratory Measurement of Impact Sound Transmission Through Floor-Ceiling A
...