Contents 1 Areas 1.1 Mechanics 1.2 Thermodynamics 1.3 Electromagnetism 1.4 Light 1.5 Acoustics 1.6 Information science and technology 1.7 Other areas 2 International System of Quantities 3 Units of ISO/IEC 80000 4 See also 5 References 6 External links

Areas The standard has 14 parts.[2] Mechanics ISO 80000-4:2006 supersedes ISO 31-3.[3] and specifies names and symbols for quantities and units of classical mechanics, and defines these names and symbols. The document is under review.[4] Thermodynamics ISO 80000-5:2007 supersedes ISO 31-4[5] which "gives names, symbols and definitions for quantities and units of thermodynamics". The document is under review.[6] Electromagnetism IEC 80000-6:2008 supersedes ISO 31-5[7] as well as IEC 60027-1, and specifies names and symbols for quantities and units related to electromagnetism, and defines these quantities and units. Light ISO 80000-7:2008 supersedes ISO 31-6,[8] and specifies names and symbols to quantities and units for light and other electromagnetic radiation, and defines these quantities and units. The document is under review.[9] Acoustics ISO 80000-8:2007 specifies names, symbols for quantities and units of acoustics and provides definitions for these quantities and units. It supersedes ISO 31-7[10] and is under review.[11] It has a foreword; introduction; scope; normative references; and names, symbols and definitions. 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 ps): 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 cg): cg = dω/dk sound energy density (symbol w): time-averaged sound energy in a given volume divided by that volume sound power (symbol P, Pa): 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 Zc): 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 Za): 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 Zm): 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 Lp): sound power level (symbol LW): sound exposure level (symbol LE): 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 Tn): Information science and technology IEC 80000-13:2008 defines quantities and units used in information science, and specifies names and symbols for these quantities and units.[12] The document was last-published in 2008, and replaces subclauses 3.8 and 3.9 of IEC 60027-2:2005 and IEC 60027-3. It has a scope; normative references; names, definitions and symbols; and prefixes for binary multiples. Quantities defined in this standard are: traffic intensity [A]: number of simultaneously busy resources in a particular pool of resources traffic offered intensity [A0]: traffic intensity ... of the traffic that would have been generated by the users of a pool of resources if their use had not been limited by the size of the pool traffic carried intensity [Y]: traffic intensity ... of the traffic served by a particular pool of resources mean queue length [L, (Ω)]: time average of queue length loss probability [B]: probability for losing a call attempt waiting probability [W]: probability for waiting for a resource call intensity, calling rate [λ]: number of call attempts over a specified time interval divided by the duration (ISO 80000-3 ...) of this interval completed call intensity [μ]: call intensity ... for the call attempts that result in the transmission of an answer signal storage capacity, storage size [M] equivalent binary storage capacity [Me] transfer rate [r, (ν)] period of data elements [T] binary digit rate, bit rate [rb, rbit (νb, νbit)] period of binary digits, bit period [Tb, Tbit] equivalent binary digit rate, equivalent bit rate [re, (νe)] modulation rate, line digit rate [rm, u] quantizing distortion power [TQ] carrier power [Pc, C] signal energy per binary digit [Eb, Ebit] error probability [P] Hamming distance [dn] clock frequency, clock rate [fcl] decision content [Da] information content [I(x)] entropy [H] maximum entropy [H0, (Hmax)] relative entropy [Hr] redundancy [R] relative redundancy [r] joint information content [I(x, y)] conditional information content [I(x|y)] conditional entropy, mean conditional information content, average conditional information content [H(X|Y)] equivocation [H(X∣Y)] irrelevance [C] transinformation content [T(x, y)] mean transinformation content [T] character mean entropy [H′] average information rate [H*] character mean transinformation content [T′] average transinformation rate [T*] channel capacity per character; channel capacity [C′] channel time capacity; channel capacity [C*] The Standard also includes definitions for units relating to information technology, such as the erlang (symbol E), bit (bit), octet (o), byte (B), baud (Bd), shannon (Sh), hartley (Hart) and the natural unit of information (nat). Clause 4 of the Standard defines standard binary prefixes used to denote powers of 1024 as 10241 (kibi-), 10242 (mebi-), 10243 (gibi-), 10244 (tebi-), 10245 (pebi-), 10246 (exbi-), 10247 (zebi-) and 10248 (yobi-). Other areas Part Year Name Replaces Status[13] ISO 80000-1[14] 2009 General ISO 31-0, IEC 60027-1 and IEC 60027-3 under review ISO 80000-2[15] 2009 Mathematical signs and symbols to be used in the natural sciences and technology ISO 31-11, IEC 60027-1 under review ISO 80000-3[16] 2006 Space and time ISO 31-1 and ISO 31-2 under review ISO 80000-9 2008 Physical chemistry and molecular physics ISO 31-8 under review ISO 80000-10 2009 Atomic and nuclear physics ISO 31-9 and ISO 31-10 under review ISO 80000-11 2008 Characteristic numbers ISO 31-12 under review ISO 80000-12 2009 Solid state physics ISO 31-13 under review IEC 80000-14 2008 Telebiometrics related to human physiology IEC 60027-7 withdrawn

International System of Quantities Main article: International System of Quantities Part 1 of ISO/IEC 80000 introduces the International System of Quantities and describes its relationship with the International System of Units (SI). Specifically, its introduction states "The system of quantities, including the relations among the quantities used as the basis of the units of the SI, is named the International System of Quantities, denoted 'ISQ', in all languages.", and further clarifies that "ISQ is simply a convenient notation to assign to the essentially infinite and continually evolving and expanding system of quantities and equations on which all of modern science and technology rests".

Units of ISO/IEC 80000 The standard includes all SI units but is not limited to only SI units. Units that form part of the standard but not the SI include the units of information storage (bit and byte), units of entropy (shannon, natural unit of information and hartley), the erlang (a unit of traffic intensity) and units of level (neper and decibel). The standard includes all SI prefixes as well as the binary prefixes kibi-, mebi-, gibi-, etc., originally introduced by the International Electrotechnical Commission to standardise binary multiples of byte such as mebibyte (MiB), for 7003102400000000000♠10242 bytes, to distinguish them from their decimal counterparts such as megabyte (MB), for precisely one million (7003100000000000000♠10002) bytes. In the standard, the application of the binary prefixes is not limited to units of information storage. For example, a frequency ten octaves above one hertz, i.e., 210 Hz (7003102400000000000♠1024 Hz), is one kibihertz (1 KiHz). Historically, these binary prefixes were standardized first in a 1999 addendum to IEC 60027-2. The harmonized IEC 80000-13:2008 standard obsoletes and replaces subclauses 3.8 and 3.9 of IEC 60027-2:2005, which had defined the prefixes for binary multiples. The only significant change in IEC 80000 is the addition of explicit definitions for some quantities.

See also International Vocabulary of Metrology International System of Units BIPM – publishes freely available information on SI units NIST – official U.S. representative for SI; publishes freely available guide to use of SI

References ^ Standards Catalogue TC/12 Quantities and Units ^ BSI/ISO Standards ^ "ISO 80000-4:2006". International Organization for Standardization. Retrieved 20 July 2013.  ^ Standards and projects under the direct responsibility of ISO/TC 12 Secretariat ^ "ISO 80000-5:2007". International Organization for Standardization. Retrieved 20 July 2013.  ^ Standards and projects under the direct responsibility of ISO/TC 12 Secretariat ^ "IEC 80000-6:2008". International Organization for Standardization. Retrieved 20 July 2013.  ^ "ISO 80000-7:2008". International Organization for Standardization. Retrieved 21 July 2013.  ^ Standards and projects under the direct responsibility of ISO/TC 12 Secretariat ^ "ISO 80000-8:2007". International Organization for Standardization. Retrieved 21 July 2013.  ^ Standards and projects under the direct responsibility of ISO/TC 12 Secretariat ^ "IEC 80000-13:2008". International Organization for Standardization. Retrieved 21 July 2013.  ^ Standards and projects under the direct responsibility of ISO/TC 12 Secretariat ^ "ISO 80000-1:2009". International Organization for Standardization. Retrieved 20 July 2013.  ^ "ISO 80000-2:2009". International Organization for Standardization. Retrieved 1 July 2010.  ^ "ISO 80000-3:2006". International Organization for Standardization. Retrieved 20 July 2013.

External links BIPM SI Brochure ISO TC12 standards – Quantities, units, symbols, conversion factors NIST Special Publication 330 – The International System of Units NIST Special Publication 811 – Guide for the Use of the International System of Units v t e 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 2848 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 9899 9945 9984 9985 9995 10000–19999 10005 10006 10007 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 13450 13485 13490 13567 13568 13584 13616 14000 14031 14224 14289 14396 14443 14496 -2 -3 -6 -10 -11 -12 -14 -17 -20 14644 14649 14651 14698 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 17100 17203 17369 17442 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 19600:2014 19752 19757 19770 19775-1 19794-5 19831 20000+ 20000 20022 20121 20400 21000 21047 21500 21827:2002 22000 23270 23271 23360 24517 24613 24617 24707 25178 25964 26000 26300 26324 27000 series 27000 27001 27002 27006 27729 28000 29110 29148 29199-2 29500 30170 31000 32000 38500 40500 42010 55000 80000 -1 -2 -3 Category v t e List of International Electrotechnical Commission standards IEC standards IEC 60027 IEC 60034 IEC 60038 IEC 60062 IEC 60063 IEC 60068 IEC 60112 IEC 60228 IEC 60269 IEC 60297 IEC 60309 IEC 60320 IEC 60364 IEC 60446 IEC 60559 IEC 60601 IEC 60870 IEC 60870-5 IEC 60870-6 IEC 60906-1 IEC 60908 IEC 60929 IEC 60958 AES3 S/PDIF IEC 61030 IEC 61131 IEC 61131-3 IEC 61158 IEC 61162 IEC 61334 IEC 61346 IEC 61355 IEC 61400 IEC 61499 IEC 61508 IEC 61511 IEC 61850 IEC 61851 IEC 61883 IEC 61960 IEC 61968 IEC 61970 IEC 62014-4 IEC 62056 IEC 62061 IEC 62196 IEC 62262 IEC 62264 IEC 62304 IEC 62325 IEC 62351 IEC 62365 IEC 62366 IEC 62379 IEC 62386 IEC 62455 IEC 62680 IEC 62682 IEC 62700 ISO/IEC standards ISO/IEC 646 ISO/IEC 2022 ISO/IEC 4909 ISO/IEC 5218 ISO/IEC 6429 ISO/IEC 6523 ISO/IEC 7810 ISO/IEC 7811 ISO/IEC 7812 ISO/IEC 7813 ISO/IEC 7816 ISO/IEC 7942 ISO/IEC 8613 ISO/IEC 8632 ISO/IEC 8652 ISO/IEC 8859 ISO/IEC 9126 ISO/IEC 9293 ISO/IEC 9592 ISO/IEC 9593 ISO/IEC 9899 ISO/IEC 9945 ISO/IEC 9995 ISO/IEC 10021 ISO/IEC 10116 ISO/IEC 10165 ISO/IEC 10179 ISO/IEC 10646 ISO/IEC 10967 ISO/IEC 11172 ISO/IEC 11179 ISO/IEC 11404 ISO/IEC 11544 ISO/IEC 11801 ISO/IEC 12207 ISO/IEC 13250 ISO/IEC 13346 ISO/IEC 13522-5 ISO/IEC 13568 ISO/IEC 13818 ISO/IEC 14443 ISO/IEC 14496 ISO/IEC 14882 ISO/IEC 15288 ISO/IEC 15291 ISO/IEC 15408 ISO/IEC 15444 ISO/IEC 15445 ISO/IEC 15504 ISO/IEC 15511 ISO/IEC 15693 ISO/IEC 15897 ISO/IEC 15938 ISO/IEC 16262 ISO/IEC 17024 ISO/IEC 17025 ISO/IEC 18000 ISO/IEC 18004 ISO/IEC 18014 ISO/IEC 19752 ISO/IEC 19757 ISO/IEC 19770 ISO/IEC 19788 ISO/IEC 20000 ISO/IEC 21000 ISO/IEC 21827 ISO/IEC 23000 ISO/IEC 23003 ISO/IEC 23008 ISO/IEC 23270 ISO/IEC 23360 ISO/IEC 24707 ISO/IEC 24727 ISO/IEC 24744 ISO/IEC 24752 ISO/IEC 26300 ISO/IEC 27000 ISO/IEC 27000-series ISO/IEC 27002 ISO/IEC 27040 ISO/IEC 29119 ISO/IEC 33001 ISO/IEC 38500 ISO/IEC 42010 ISO/IEC 80000 Related International Electrotechnical Commission Retrieved from "https://en.wikipedia.org/w/index.php?title=ISO/IEC_80000&oldid=815055827" Categories: Physical quantitiesMeasurementISO/IEC standardsHidden categories: Articles needing additional references from November 2013All articles needing additional referencesAll articles with unsourced statementsArticles with unsourced statements from October 2016