add new SI prefixes; add binary prefixes

This commit is contained in:
Peter McGoron 2024-05-22 20:51:34 -04:00
parent f3bef172ea
commit c6bd1cea8d
1 changed files with 43 additions and 3 deletions

46
si.7
View File

@ -1,4 +1,4 @@
.Dd $Mdocdate: April 2 2022 $
.Dd $Mdocdate: May 22 2024 $
.Dt SI 7
.Os
.Sh NAME
@ -15,12 +15,16 @@ section are from NIST SP 811,
.Em NIST Guide for the Use of the International System of Units (SI) ,
2008,
.Lk https://www.nist.gov/pml/special-publication-811 .
The IEC binary prefixes are defined in ISO/IEC 80000-13.
.Sh PREFIXES
.TS
allbox tab( );
c | c | c || c | c | c
l c r || l c r.
Name Prefix Power Name Prefix Power
quetta Q 30 quecto q -30
ronna R 27 ronto r -27
yotta Y 24 yocto y -24
zetta Z 21 zepto z -21
exa E 18 atto a -18
@ -32,6 +36,37 @@ kilo k 3 milli m -3
hecto h 2 centi c -2
deka da 1 deci d -1
.TE
.Sh BINARY PREFIXES
Binary prefixes multiply a unit by a power of 2. They not a part of the
SI system. Most people will say
.Dq kilobyte
instead of
.Dq kibibyte ,
.Dq megabyte
instead of
.Dq mebibyte ,
and so on. Mac OSX and Linux utilities commonly report
units using the binary prefixes
(
.Dq KiB ,
.Dq MiB ,
etc).
.TS
allbox tab( );
c | c | c
l c r.
Name Prefix Power Related
kibi Ki 10 kilo
mebi Mi 20 mega
gibi Gi 30 giga
tebi Ti 40 tera
pebi Pi 50 peta
exbi Ei 60 exa
zebi Zi 70 zetta
yobi Yi 80 yotta
.TE
.Sh BASE UNITS
.TS
allbox;
@ -46,6 +81,7 @@ temperature kelvin K \(*H
luminosity candela cd J
Unitless = 1 =
.TE
Unitless quantities (like indices of refraction) are usually written
with no symbol at all, or with a conventional symbol, like
.Dq rad
@ -106,6 +142,7 @@ T{
catalytic activity
T} katal kat mol s⁻¹ =
.TE
The equivalent units for pressure do not appear in the source.
.Sh SAMPLE OF OTHER DERIVED UNITS
.TS
@ -139,7 +176,8 @@ radiant intensity
T} W sr⁻¹ kg m² s⁻³
radiance W sr⁻¹ m⁻² kg s⁻³
.TE
The source gives more examples.
The sources give more examples.
.Sh NON-SI UNITS ACCEPTED FOR USE IN SI
.TS
allbox;
@ -171,6 +209,7 @@ T} neper Np natural log
\^ bel B base-10 log
\^ decibel dB 1 dB = 10⁻¹ B
.TE
.Sh NOT-ACCEPTABLE NON-SI UNITS STILL IN USE
.TS
allbox;
@ -189,5 +228,6 @@ T{
magnetic flux density
T} gauss G OR Gs 1 G = 100 μT
.TE
.Sh INFO
This file is public domain. Manual page version 1.0.
This file is public domain. Manual page version 2.0.