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+.Dd $Mdocdate: April 2 2022  $
+.Dt SI 7
+.Os
+.Sh NAME
+.Nm SI
+.Nd The International System of Units
+.Sh SOURCE
+NIST SP 330,
+.Em The International System of Units (SI) ,
+2019 edition,
+.Lk https://doi.org/10.6028/NIST.SP.330-2019 .
+Some data from the
+.Sx NOT-ACCEPTABLE NON-SI UNITS STILL IN USE
+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 .
+.Sh PREFIXES
+.TS
+allbox tab( );
+c | c | c || c | c | c
+l c r || l c r.
+Name Prefix Power Name Prefix Power
+yotta Y 24 yocto y -24
+zetta Z 21 zepto z -21
+exa E 18 atto a -18
+peta P 15 femto f -15
+tera T 12 pico p -12
+giga G 9 nano n -9
+mega M 6 micro \(mc -6
+kilo k 3 milli m -3
+hecto h 2 centi c -2
+deka da 1 deci d -1
+.TE
+.Sh BASE UNITS
+.TS
+allbox;
+r | l | c | c
+r l c c.
+Quantity	Unit	Symbol	Dimension
+time	second	s	T
+length	meter	m	L
+kilogram	mass	m	M
+current	ampere	A	I
+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
+(see below).
+.Sh DERIVED UNITS
+.TS
+allbox;
+r | l | c | c | c
+l l c c c.
+Quantity	Unit	Symbol	Base Units	Equivalent
+plane angle	radian	rad	m/m	1
+solid angle	steradian	sr	m\(S2/m\(S2	1
+frequency	hertz	Hz	s⁻¹	=
+force	newton	N	kg m s⁻²	=
+T{
+pressure, stress
+T}	pascal	Pa	kg m⁻¹ s⁻²	N m⁻²
+T{
+energy, work, heat
+T}	joule	J	kg m² s⁻²	N m
+T{
+power, radiant flux
+T}	watt	W	kg m² s⁻³	J/s
+T{
+electric potential difference
+T}	volt	V	kg m² s⁻³ A⁻¹	W/A
+charge	columb	C	A s	=
+capacitance	farad	F	kg⁻¹ m⁻² s⁴ A²	C/V
+resistance	ohm	\(*W	kg m² s⁻³ A⁻²	V/A
+conductance	siemens	S	kg⁻¹ m⁻² s³ A²	A/V
+T{
+magnetic flux
+T}	weber	Wb	kg m² s⁻² A⁻¹	V s
+T{
+magnetic flux density
+T}	tesla	T	kg s⁻² A⁻¹	Wb m⁻²
+inductance	henry	H	kg m² s⁻² A⁻²	Wb/A
+T{
+temperature, celsius
+T}	celsius	\(de C	K + 273.15	=
+T{
+luminous flux
+T}	lumen	lm	cd sr	=
+T{
+illuminance
+T}	lux	cd sr m⁻²	lm m⁻²
+T{
+activity referred to a
+radionuclide
+T}	becquerel	Bq	s⁻¹	=
+T{
+absorbed dose, kerma
+T}	gray	m² s⁻²	J/kg
+T{
+dose equivalent
+T}	sievert	Sv	m² s⁻²	J/kg
+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
+allbox;
+l r r.
+Quantity	Units	Base
+dynamic viscosity	Pa s	kg m⁻¹ s⁻¹
+surface tension	N m	kg m² s⁻²
+T{
+angular velocity, angular frequency
+T}	rad s⁻¹	s⁻¹
+T{
+heat flux density, irradiance
+T}	W m⁻²	kg s⁻³
+T{
+heat capacity, entropy
+T}	J K⁻¹	kg m² s⁻² K⁻¹
+T{
+specific heat capacity, specific entropy
+T}	J K⁻¹ kg⁻¹	m² s⁻² K⁻¹
+T{
+thermal conductivity
+T}	W m⁻¹ K⁻¹	kg m s⁻³ K⁻¹
+T{
+electric field strength
+T}	V m⁻¹	kg m⁻¹ s⁻³ A⁻¹
+permittivity	F m⁻¹	kg⁻¹ m⁻³ s⁴ A²
+permeability	H m⁻¹	kg m s⁻² A⁻²
+T{
+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.
+.Sh NON-SI UNITS ACCEPTED FOR USE IN SI
+.TS
+allbox;
+l l c r.
+Quantity	Name	Sym.	Value
+time	minute	min	1 min = 60 s
+\^	hour	h	1 h = 60 min = 3600 s
+\^	day	d	1 d = 24 h = 86400 s
+length	T{
+astronomical unit
+T}	au	T{
+1 au = 149 597 870 700 m
+T}
+angle	degree	\(de	1\(de = (\(*p/180) rad
+\^	minute	\(fm	T{
+1\(fm = (1/60)\(de = (\(*p/10 800) rad
+T}
+\^	second	\(sd	T{
+1\(sd = (1/60)\(de = (\(*p/648 000) rad
+T}
+area	hectare	ha	1 ha = 1 hm² = 10⁴ m²
+volume	liter	L	1 L = 1 dm³ = 10³ cm³ = 10⁻³ m³
+mass	metric ton	t	1 t = 10³ kg
+\^	dalton	Da	1 Da = 1.660 539 040 (20) E-27 kg
+energy	electronvolt	eV	1 eV = 1.602 176 634 e-19 J
+T{
+logarithmic quantities
+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;
+l l c r.
+Quantity	Name	Sym.	Value
+length	ångström	\(oA	10⁻¹⁰ m
+\^	micron	\(*m	1 \(*mm
+\^	parsec	pc	1 pc = 3.085 678E+16 m
+T{
+radiation dose
+T}	rad	rad OR rd	1 rd = 10⁻² Gy
+pressure	T{
+millimeter of mercury
+T}	mmHg	1 mmHg \(=~ 133.322 Pa
+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.