ISO 80000-8

ISO 80000-8:2007 is an ISO standard entitled Quantities and units – Part 8: Acoustics, which supersedes ISO 31-7.^[1] It is a part of the group of standards called ISO/IEC 80000. The standard specifies names, symbols for quantities and units of acoustics and provides definitions for these quantities and units.

Contents list

The standard is divided into the following chapters:

• Foreword
• Introduction

1. Scope
2. Normative references
3. Names, symbols and definitions

Examples

The standard includes definitions of sound pressure, sound power and sound exposure, and their corresponding levels: sound pressure level, sound power level and sound exposure level. For example

• period duration (symbol T): duration of one cycle of a periodic phenomenon
• frequency (symbol f): f = 1/T
• logarithmic frequency interval (symbol G): G = lb(f₂/f₁)
• angular frequency (symbol ω): ω = 2πf
• wavelength (symbol λ): for a sinusoidal wave and in a direction perpendicular to the wavefront, distance between two successive points where at a given instant the phase ... differs by 2 π
• wavenumber (symbol σ): σ = 1/λ
• angular wavenumber (symbol k): k = ω/c
• density (symbol ρ): ρ = m/V
• static pressure (symbol p_s): pressure that would exist in the absence of sound waves

• sound pressure (symbol p): difference between instantaneous total pressure and static pressure
• sound particle displacement (symbol δ): instantaneous displacement of a particle in a medium from what would be its position in the absence of sound waves
• sound particle velocity (symbol v,u): v = dδ/dt
• sound particle acceleration (symbol a): a = dv/dt
• sound volume velocity (symbol q): surface integral of the normal component of the sound particle velocity ... over the cross-section (through which the sound propagates)
• phase speed of sound (symbol c): c = ω/k
• group speed of sound (symbol c_g): c_g = dω/dk
• sound energy density (symbol w): time-averaged sound energy in a given volume divided by that volume
• sound power (symbol P, P_a): through a surface, product of the sound pressure ... and the component of the particle velocity ... at a point on the surface in the direction normal to the surface, integrated over that surface
• sound intensity (symbol i): i = p.v
• time-averaged sound intensity (symbol I):
• sound exposure (symbol E):
• characteristic impedance of a medium (symbol Z_c): at a point in a non-dissipative medium and for a plane progressive wave, the quotient of the sound pressure ... by the component of the sound particle velocity ... in the direction of the wave propagation
• acoustic impedance (symbol Z_a): at a surface, the complex quotient of the average sound pressure ... over that surface by the sound volume flow rate ... through that surface
• mechanical surface impedance (symbol Z_m): at a surface, the complex quotient of the total force on the surface by the component of the average sound particle velocity ... at the surface in the direction of the force
• sound pressure level (symbol L_p):
• sound power level (symbol L_W):
• sound exposure level (symbol L_E):
• attenuation coefficient (symbol α):
• phase coefficient (symbol β):
• propagation coefficient (symbol γ):
• dissipation factor for sound power (symbol δ, ψ):
• reflection factor for sound power (symbol r):
• transmission factor for sound power (symbol τ):
• absorption factor for sound power (symbol α):
• sound reduction index (symbol R):
• equivalent absorption area of a surface or object (symbol A):
• reverberation time (symbol T_n):

See also

• ISO 80000-1 General
• ISO 80000-2 Mathematical signs and symbols to be used in the natural sciences and technology
• ISO 80000-3 Space and time
• ISO 80000-4 Mechanics
• ISO 80000-5 Thermodynamics
• ISO 80000-6 Electromagnetism
• ISO 80000-7 Light
• ISO 80000-9 Physical chemistry and molecular physics
• ISO 80000-10 Atomic and nuclear physics
• ISO 80000-11 Characteristic numbers
• ISO 80000-12 Solid state physics
• IEC 80000-13 Information science and technology
• IEC 80000-14 Telebiometrics related to human physiology

References

ISO standards by standard number List of ISO standards / ISO romanizations / IEC standards 1–9999 1 2 3 4 5 6 7 9 16 31 -0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 128 216 217 226 228 233 259 269 302 306 428 518 519 639 -1 -2 -3 -5 -6 646 690 732 764 843 898 965 1000 1004 1007 1073-1 1413 1538 1745 1989 2014 2015 2022 2047 2108 2145 2146 2240 2281 2709 2711 2788 2852 3029 3103 3166 -1 -2 -3 3297 3307 3602 3864 3901 3977 4031 4157 4217 4909 5218 5428 5775 5776 5800 5964 6166 6344 6346 6385 6425 6429 6438 6523 6709 7001 7002 7098 7185 7200 7498 7736 7810 7811 7812 7813 7816 8000 8178 8217 8571 8583 8601 8632 8652 8691 8807 8820-5 8859 -1 -2 -3 -4 -5 -6 -7 -8 -8-I -9 -10 -11 -12 -13 -14 -15 -16 8879 9000/9001 9075 9126 9293 9241 9362 9407 9506 9529 9564 9594 9660 9897 9945 9984 9985 9995 10000–19999 10006 10116 10118-3 10160 10161 10165 10179 10206 10218 10303 -11 -21 -22 -28 -238 10383 10487 10585 10589 10646 10664 10746 10861 10957 10962 10967 11073 11170 11179 11404 11544 11783 11784 11785 11801 11898 11940 (-2) 11941 11941 (TR) 11992 12006 12182 12207 12234-2 13211 -1 -2 13216 13250 13399 13406-2 13407 13450 13485 13490 13567 13568 13584 13616 14000 14031 14224 14289 14396 14443 14496 -2 -3 -6 -10 -11 -12 -14 -17 -20 14644 -1 -2 -3 -4 -5 -6 -7 -8 -9 14649 14651 14698 -2 14750 14764 14882 14971 15022 15189 15288 15291 15292 15398 15408 15444 -3 15445 15438 15504 15511 15686 15693 15706 -2 15707 15897 15919 15924 15926 15926 WIP 15930 16023 16262 16612-2 16750 16949 (TS) 17024 17025 17203 17369 17799 18000 18004 18014 18245 18629 18916 19005 19011 19092 (-1 -2) 19114 19115 19125 19136 19439 19500 19501 19502 19503 19505 19506 19507 19508 19509 19510 19752 19757 19770 19775-1 19794-5 19831 20000+ 20000 20022 20121 21000 21047 21500 21827:2002 22000 23270 23271 23360 24517 24613 24617 24707 25178 25964 26000 26300 26324 27000 series 27000 27001:2005 27001:2013 27002 27003 27004 27005 27006 27007 27729 27799 28000 29110 29148 29199-2 29500 30170 31000 32000 38500 42010 80000 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 Categories ISO standards ISO 639 ISO 3166 ISO / IEC standards OSI protocols All articles with prefix "ISO"