add new SI prefixes; add binary prefixes
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si.7
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si.7
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.Dd $Mdocdate: April 2 2022 $
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.Dd $Mdocdate: May 22 2024 $
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.Dt SI 7
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.Os
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.Sh NAME
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@ -15,12 +15,16 @@ section are from NIST SP 811,
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.Em NIST Guide for the Use of the International System of Units (SI) ,
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2008,
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.Lk https://www.nist.gov/pml/special-publication-811 .
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The IEC binary prefixes are defined in ISO/IEC 80000-13.
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.Sh PREFIXES
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.TS
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allbox tab( );
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c | c | c || c | c | c
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l c r || l c r.
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Name Prefix Power Name Prefix Power
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quetta Q 30 quecto q -30
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ronna R 27 ronto r -27
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yotta Y 24 yocto y -24
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zetta Z 21 zepto z -21
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exa E 18 atto a -18
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@ -32,6 +36,37 @@ kilo k 3 milli m -3
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hecto h 2 centi c -2
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deka da 1 deci d -1
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.TE
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.Sh BINARY PREFIXES
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Binary prefixes multiply a unit by a power of 2. They not a part of the
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SI system. Most people will say
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.Dq kilobyte
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instead of
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.Dq kibibyte ,
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.Dq megabyte
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instead of
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.Dq mebibyte ,
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and so on. Mac OSX and Linux utilities commonly report
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units using the binary prefixes
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(
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.Dq KiB ,
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.Dq MiB ,
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etc).
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.TS
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allbox tab( );
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c | c | c
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l c r.
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Name Prefix Power Related
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kibi Ki 10 kilo
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mebi Mi 20 mega
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gibi Gi 30 giga
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tebi Ti 40 tera
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pebi Pi 50 peta
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exbi Ei 60 exa
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zebi Zi 70 zetta
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yobi Yi 80 yotta
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.TE
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.Sh BASE UNITS
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.TS
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allbox;
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@ -46,6 +81,7 @@ temperature kelvin K \(*H
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luminosity candela cd J
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Unitless = 1 =
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.TE
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Unitless quantities (like indices of refraction) are usually written
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with no symbol at all, or with a conventional symbol, like
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.Dq rad
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@ -106,6 +142,7 @@ T{
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catalytic activity
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T} katal kat mol s⁻¹ =
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.TE
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The equivalent units for pressure do not appear in the source.
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.Sh SAMPLE OF OTHER DERIVED UNITS
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.TS
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@ -139,7 +176,8 @@ radiant intensity
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T} W sr⁻¹ kg m² s⁻³
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radiance W sr⁻¹ m⁻² kg s⁻³
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.TE
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The source gives more examples.
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The sources give more examples.
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.Sh NON-SI UNITS ACCEPTED FOR USE IN SI
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.TS
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allbox;
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@ -171,6 +209,7 @@ T} neper Np natural log
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\^ bel B base-10 log
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\^ decibel dB 1 dB = 10⁻¹ B
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.TE
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.Sh NOT-ACCEPTABLE NON-SI UNITS STILL IN USE
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.TS
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allbox;
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@ -189,5 +228,6 @@ T{
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magnetic flux density
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T} gauss G OR Gs 1 G = 100 μT
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.TE
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.Sh INFO
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This file is public domain. Manual page version 1.0.
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This file is public domain. Manual page version 2.0.
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