Name	Notation	Description	Types	Status
minute (angle)	'	Unit of plane or phase angle, accepted for use with SI: 1 ' =...	Concept	stable
second (angle)	''	Unit of plane or phase angle, accepted for use with SI: 1 '' ...	Concept	stable
dimensionless	1	Dimensionless; SI base unit equivalent: 1	Concept	stable
ampere	A	SI base unit of electric current	Concept	stable
astronomical unit	AU	Unit of length, accepted for use with SI: 1 AU = 149597870700...	Concept	stable
becquerel	Bq	SI derived unit of radioactivity; SI base unit equivalent: s-...	Concept	stable
becquerel per litre	Bq.l-1	Unit of radioactivity concentration; SI base unit equivalent:...	Concept	stable
becquerel per square metre	Bq.m-2	SI derived unit of radioactivity area concentration; SI base ...	Concept	stable
becquerel per cubic metre	Bq.m-3	SI derived unit of radioactivity concentration; SI base unit ...	Concept	stable
becquerel second per cubic metre	Bq.s.m-3	SI derived unit of time integrated radioactivity concentratio...	Concept	stable
coulomb	C	SI derived unit of electric charge; SI base unit equivalent: ...	Concept	stable
colony-forming unit per millilitre	CFU.ml-1	Unit of number concentration of viable bacteria or fungal cel...	Concept	stable
Dobson Unit	DU	Unit of column abundance of molecules in the atmosphere. 1 DU...	Concept	stable
Eötvös	E	Unit of acceleration divided by distance,1 E = 1E-9 Gal/cm; S...	Concept	stable
farad	F	SI derived unit of electrical capacitance; SI base unit equiv...	Concept	stable
gigahertz	GHz	SI derived unit of frequency; SI base unit equivalent: 1E9 s-...	Concept	stable
gray	Gy	SI derived unit of absorbed dose (of ionizing radiation); SI ...	Concept	stable
henry	H	SI derived unit of electrical inductance; SI base unit equiva...	Concept	stable
Hazen unit	HU	Unit of color according to the Platinum/Cobalt or Apha-Hazen ...	Concept	stable
hertz	Hz	SI derived unit of frequency; SI base unit equivalent: s-1	Concept	stable
joule	J	SI derived unit of energy, work, heat; SI base unit equivalen...	Concept	stable
joule per kilogram	J.kg-1	SI derived unit of specific energy or specific potential enth...	Concept	stable
joule per square metre	J.m-2	SI derived unit of radiant exposure; SI base unit equivalent:...	Concept	stable
kelvin	K	SI base unit of thermodynamic temperature	Concept	stable
kelvin per metre	K.m-1	SI derived unit of spatial gradient of temperature	Concept	stable
kelvin metre per second	K.m.s-1	SI derived unit of covariance of wind speed and temperature o...	Concept	stable
kelvin square metre per kilogram per second	K.m2.kg-1.s-1	SI derived unit of potential vorticity	Concept	stable
megahertz	MHz	SI derived unit of frequency; SI base unit equivalent: 1E6 s-...	Concept	stable
most probable number index number in 1 millilitre	MPN.ml-1	Unit of expected number concentration of bacteria in the orig...	Concept	stable
per megametre	Mm-1	Unit of quantity with dimension of reciprocal length, e.g., o...	Concept	stable
per megametre per steradian	Mm-1.sr-1	SI derived unit of the scattering coefficient at a given dire...	Concept	stable
newton	N	SI derived unit of force, weight	Concept	stable
newton per square metre	N.m-2	SI derived unit of pressure or equivalent quantity	Concept	stable
nephelometric turbidity unit	NTU	Units of turbidity from a calibrated nephelometer; SI base un...	Concept	stable
N units	N_units	Unit of atmospheric refractivity, the refractivity, N, is rel...	Concept	stable
ohm	Ohm	SI derived unit of electrical resistance, impedance, reactanc...	Concept	stable
pascal	Pa	SI derived unit of pressure/stress; SI base unit equivalent: ...	Concept	stable
pascal per second	Pa.s-1	SI derived unit of temporal derivative of pressure/stress; SI...	Concept	stable
siemens	S	SI derived unit of electrical conductance; SI base unit equiv...	Concept	stable
siemens per metre	S.m-1	SI derived unit of spatial gradient of electric conductance	Concept	stable
sievert	Sv	SI derived unit of equivalent dose (of ionizing radiation); S...	Concept	stable
tesla	T	SI derived unit of magnetic induction, magnetic flux density;...	Concept	stable
terahertz	THz	SI derived unit of frequency; SI base unit equivalent: 1E12 s...	Concept	stable
volt	V	SI derived unit of voltage, electrical potential difference, ...	Concept	stable
watt	W	SI derived unit of power, radiant flux; SI base unit equivale...	Concept	stable
watt per metre per steradian	W.m-1.sr-1	SI derived unit of spectral intensity; SI base unit equivalen...	Concept	stable
watt per square metre	W.m-2	SI derived unit of heat flux density or irradiance; SI base u...	Concept	stable
watt per square metre per steradian	W.m-2.sr-1	SI derived unit of radiance; SI base unit equivalent: kg.s-3	Concept	stable
watt per square metre per steradian per inverse centimetre	W.m-2.sr-1.cm	SI derived unit of spectral radiance per wave number, wave nu...	Concept	stable
watt per square metre per steradian per inverse metre	W.m-2.sr-1.m	SI derived unit of spectral radiance per wave number; SI base...	Concept	stable
watt per cubic metre per steradian	W.m-3.sr-1	SI derived unit of spectral radiance; SI base unit equivalent...	Concept	stable
Weber	Wb	SI derived unit of magnetic flux; SI base unit equivalent: kg...	Concept	stable
year	a	Conventional unit of time duration, ranging from 365 days to ...	Concept	stable
centibar per 12 hours	cb.(12h)-1	Conventional unit of time derivative of pressure, pressure te...	Concept	stable
centibar per second	cb.s-1	Conventional unit of time derivative of pressure, pressure te...	Concept	stable
candela	cd	SI base unit of luminous intensity	Concept	stable
centimetre	cm	SI prefixed unit of length; SI base unit equivalent: 0.01 m	Concept	stable
per cubic centimetre	cm-3	SI derived unit of specific volume; SI base unit equivalent: ...	Concept	stable
centimetre per hour	cm.h-1	SI derived unit of speed; SI base unit equivalent: 1/360000 m...	Concept	stable
centimetre per second	cm.s-1	SI derived unit of speed; SI base unit equivalent: 0.01 m.s-1	Concept	stable
square centimetre	cm2	SI derived unit of area; SI base unit equivalent: 1E-4 m2	Concept	stable
cubic centimetre per cubic metre	cm3.m-3	SI derived unit of volumetric mixing ratio, equivalent to ppm...	Concept	stable
day	d	Unit of time, accepted for use with SI: 1 d = 86400 s	Concept	stable
decibel	dB	Unit of sound intensity, accepted for use with SI	Concept	stable
decibel per degree (angle)	dB.deg-1	Unit of angular gradient of sound intensity	Concept	stable
decibel per metre	dB.m-1	Unit of spatial gradient of sound intensity	Concept	stable
decipascal per second (microbar per second)	dPa.s-1	SI derived unit of time derivative of pressure, pressure tend...	Concept	stable
dekapascal	daPa	SI derived unit of pressure/stress; SI base unit equivalent: ...	Concept	stable
degree (angle)	deg	Unit of plane or phase angle, accepted for use with SI: 1 deg...	Concept	stable
degree (angle) per second	deg.s-1	Unit of angular speed, accepted for use with SI	Concept	stable
square degree (angle)	deg2	Unit of square of phase or plane angle, accepted for use with...	Concept	stable
degree Celsius (°C)	degC	SI derived unit of temperature, as defined by ITS-90; SI base...	Concept	stable
degree Celsius per 100 metres	degC.hm-1	SI derived unit of spatial gradient of temperature per 100 me...	Concept	stable
degree Celsius per metre	degC.m-1	SI derived unit of spatial gradient of temperature per metre;...	Concept	stable
decimetre	dm	SI prefixed unit of length; SI base unit equivalent: 0.1 m	Concept	stable
electron volt	eV	Unit of energy, accepted for use with SI; SI base unit equiva...	Concept	stable
foot	ft	Imperial/US unit of length, equal to 1200/3937 metre or 0.304...	Concept	stable
gram per cubic centimetre	g.cm-3	SI derived unit of density, equivalent to kilograms per litre...	Concept	stable
gram per kilogram	g.kg-1	SI derived unit of mass fraction, dimensionless; SI base unit...	Concept	stable
gram per kilogram per second	g.kg-1.s-1	SI derived unit of time derivative of mass fraction; SI base ...	Concept	stable
standard acceleration due to gravity	g0	Conventional unit of gravity acceleration; g0 = 9.80665 m.s-2	Concept	stable
geopotential metre	gpm	The height of a given point in the atmosphere in units propor...	Concept	stable
hour	h	Unit of time, accepted for use with SI: 1 h = 3600 s	Concept	stable
hectopascal	hPa	SI derived unit of pressure/stress; SI base unit equivalent: ...	Concept	stable
hectopascal per 3 hours	hPa.(3h)-1	SI derived unit of time derivative of pressure; SI base unit ...	Concept	stable
hectopascal per hour	hPa.h-1	SI derived unit of time derivative of pressure; SI base unit ...	Concept	stable
hectopascal per second	hPa.s-1	SI derived unit of time derivative of pressure; SI base unit ...	Concept	stable
hectare	ha	Unit of area, accepted for use with SI: 1 ha = 1E4 m2	Concept	stable
inch	in	Imperial/US unit of length, equal to 25.4 millimetres	Concept	stable
inapplicable	inapplicable	There is no value (categorical data)	Concept	stable
kilohertz	kHz	SI derived unit of frequency; SI base unit equivalent: 1000 s...	Concept	stable
kilopascal	kPa	SI derived unit of pressure/stress, equal to 1000 Pa; SI base...	Concept	stable
kilocalory per square centimetre	kcal.cm-2	Unit of radiant exposure, equal to 4.184E7 J.m-2	Concept	stable
kilogram	kg	SI base unit of mass	Concept	stable
per square kilogram per second	kg-2.s-1	SI derived unit of quantity with dimension of M-2.T-1	Concept	stable
kilogram per kilogram	kg.kg-1	SI derived unit of mass fraction; SI base unit equivalent: 1	Concept	stable
kilogram per kilogram per second	kg.kg-1.s-1	SI derived unit of time derivative of mass fraction; SI base ...	Concept	stable
kilogram per metre	kg.m-1	SI derived unit of linear mass density or quantity with dimen...	Concept	stable
kilogram per square metre	kg.m-2	SI derived unit of area density	Concept	stable
kilogram per square metre per second	kg.m-2.s-1	SI derived unit of time derivative of mass area density	Concept	stable
kilogram per cubic metre	kg.m-3	SI derived unit of density, mass density	Concept	stable
kilometre	km	SI prefixed unit of length; SI base unit equivalent: 1000 m	Concept	stable
per kilometre	km-1	SI derived unit of quantity with dimension of reciprocal leng...	Concept	stable
per kilometre per steradian	km-1.sr-1	SI derived unit of the scattering coefficient at a given dire...	Concept	stable
kilometre per day	km.d-1	SI derived unit of speed; SI base unit equivalent: 1000/86400...	Concept	stable
kilometre per hour	km.h-1	SI derived unit of speed; SI base unit equivalent: 1000/3600 ...	Concept	stable
knot	kt	Conventional unit of speed, equal to 1 nmi/h; SI base unit eq...	Concept	stable
knot per 1000 metres	kt.km-1	Conventional unit of spatial gradient of speed; SI base unit ...	Concept	stable
litre	l	SI derived unit of volume; SI base unit equivalent: 0.001 m3	Concept	stable
lumen	lm	SI derived unit of luminous flux; SI base unit equivalent: 1 ...	Concept	stable
lux	lx	SI derived unit of illuminance; SI base unit equivalent: cd.m...	Concept	stable
metre	m	SI base unit of length	Concept	stable
metre to the two thirds power per second	m(2.3-1).s-1	SI derived unit of the quantity with dimension of L^(2/3) T-1	Concept	stable
per metre	m-1	SI derived unit of quantity with dimension of reciprocal leng...	Concept	stable
per metre per steradian	m-1.sr-1	SI derived unit of the scattering coefficient at a given dire...	Concept	stable
per cubic metre	m-3	SI derived unit of specific volume	Concept	stable
metre per year	m.a-1	Conventional unit of velocity	Concept	stable
metre per second	m.s-1	SI derived unit of speed	Concept	stable
metre per second per 1000 metres	m.s-1.km-1	SI derived unit of spatial gradient of speed; SI base unit eq...	Concept	stable
metre per second per metre	m.s-1.m-1	SI derived unit of spatial gradient of speed	Concept	stable
metre per second squared	m.s-2	SI derived unit of acceleration	Concept	stable
square metre	m2	SI derived unit of area	Concept	stable
square metre second	m2.s	SI derived unit of sea surface wave variance spectral density	Concept	stable
square metre per second	m2.s-1	SI derived unit of kinematic viscosity, thermal diffusivity, ...	Concept	stable
square metre per square second	m2.s-2	SI derived quantity with dimension of squared speed	Concept	stable
square metre second per radian	m2.s.rad-1	SI derived unit of sea surface wave directional variance spec...	Concept	stable
cubic metres	m3	SI derived unit of volume	Concept	stable
cubic metre per cubic metre	m3.m-3	SI derived unit of volume fraction; SI base unit equivalent: ...	Concept	stable
cubic metre per second	m3.s-1	SI derived unit of volume flow rate or time derivative of vol...	Concept	stable
metre to the fourth power	m4	SI derived unit of the second moment of area, area moment of ...	Concept	stable
millibecquerel per cubic metre	mBq.m-3	SI derived unit of volumetric radioactivity concentration; SI...	Concept	stable
milligal	mGal	CGS unit of acceleration, equal to one thousandth of a Gal (1...	Concept	stable
millisiemens per centimetre	mS.cm-1	SI derived unit of spatial gradient of electrical conductance...	Concept	stable
millisievert	mSv	SI derived unit of equivalent dose (of ionizing radiation); S...	Concept	stable
millivolt	mV	SI derived unit of voltage, electrical potential difference, ...	Concept	stable
millibar	mbar	Conventional unit of pressure, equal to 1 hPa; SI base unit e...	Concept	stable
milligram per cubic centimetre	mg.cm-3	SI derived unit of mass concentration; SI base unit equivalen...	Concept	stable
milligram per kilogram	mg.kg-1	SI derived unit of mass fraction, equivalent to ppmm (parts p...	Concept	stable
milligram per litre	mg.l-1	SI derived unit of density or mass concentration; SI base uni...	Concept	stable
milligram per cubic metre	mg.m-3	SI derived unit of density or mass concentration; SI base uni...	Concept	stable
milligrams per cubic metre at 25 degrees	mg_m-3_25C		Concept	stable
minute (time)	min	Unit of time, accepted for use with SI: 1 min = 60 s	Concept	stable
missing	missing	The correct value is not readily available to the sender of t...	Concept	stable
millimetre	mm	SI prefixed unit of length; SI base unit equivalent: 0.001 m	Concept	stable
millimetre per hour	mm.h-1	SI derived unit of speed; SI base unit equivalent: 1/3.6E6 m....	Concept	stable
millimetre per second	mm.s-1	SI derived unit of speed; SI base unit equivalent: 0.001 m.s-...	Concept	stable
cubic millimetre per cubic metre	mm3.m-3	SI derived unit of volumetric mixing ratio, equivalent to ppb...	Concept	stable
millimetre to the sixth power per cubic metre	mm6.m-3	SI derived unit of quantity with dimension of L3; SI base uni...	Concept	stable
millimetre of mercury	mmHg	Conventional unit of pressure, equal to 133.322387415 Pa	Concept	stable
millimole per mole	mmol.mol-1	SI derived unit equivalent to expressing mole fraction in par...	Concept	stable
mole	mol	SI base unit of amount of substance	Concept	stable
mole per mole	mol.mol-1	SI derived unit of mole fraction; SI base unit equivalent: 1	Concept	stable
month	mon	Conventional unit of time duration of between 28-31 days wher...	Concept	stable
nanobar	nbar	Conventional unit of pressure; SI base unit equivalent: 1E-4 ...	Concept	stable
nanogram per kilogram	ng.kg-1	SI derived unit of mass fraction, equivalent to pptm (parts p...	Concept	stable
nanogram per cubic metre	ng.m-3	SI derived unit of mass concentration; SI base unit equivalen...	Concept	stable
nanometre	nm	SI prefixed unit of length; SI base unit equivalent: 1E-9 m	Concept	stable
nautical mile	nmi	Conventional unit of length; SI base unit equivalent: 1852 m	Concept	stable
nanomole per mole	nmol.mol-1	SI derived unit of mole fraction; SI base unit equivalent: 1E...	Concept	stable
eights of sky covered by cloud	okta	Unit of cloud amount, expressed as number of eighths of the s...	Concept	stable
pH unit	pH_unit	Negative decimal logarithm of the hydrogen ion activity ('eff...	Concept	stable
parsec	pc	Astronomical unit of length, 1 pc = 64800/Π AU	Concept	stable
per cent	percent	Dimensionless number, expressed as a fraction of 100; SI base...	Concept	stable
per mille	permil	Dimensionless number, expressed as a fraction of 1000; SI bas...	Concept	stable
picomole per mole	pmol.mol-1	SI derived unit equivalent of mole fraction; SI base unit equ...	Concept	stable
parts per billion by volume	ppbv	Unit of volume fraction, equivalent to SI derived unit: 1E-9	Concept	stable
parts per million by volume	ppmv	Unit of volume fraction, equivalent to SI derived unit: 1E-6	Concept	stable
parts per trillion by volume	pptv	Unit of volume fraction, equivalent to SI derived unit: 1E-12	Concept	stable
practical salinity unit	psu	Conventional unit, equivalent to per mille; SI based unit equ...	Concept	stable
radian	rad	SI derived unit of plane angle; SI base unit equivalent: 1	Concept	stable
radian per metre	rad.m-1	SI derived unit of spatial gradient of plane angle	Concept	stable
radian per second	rad.s-1	SI derived unit of angular velocity; SI base unit equivalent:...	Concept	stable
second	s	SI base unit of time	Concept	stable
per second squared	s-2	SI derived unit of second order time derivative	Concept	stable
second per metre	s.m-1	SI derived unit of quantity with dimension of T.L-1	Concept	stable
steradian	sr	SI derived unit of solid angle; SI base unit equivalent: 1	Concept	stable
tonne	t	Unit of mass, accepted for use with SI; SI base unit equivale...	Concept	stable
(metric) ton per hectare	t.ha-1	Unit of area density, equal to 0.1 kg.m-2	Concept	stable
unified atomic mass unit	u	Conventional unit of mass; 1 u = 1 Da (Dalton) = 1.6605390666...	Concept	stable
microsiemens per centimetre	uS.cm-1	SI derived unit of spatial gradient of electrical conductance...	Concept	stable
microgram per kilogram	ug.kg-1	SI derived unit of mass fraction, equivalent to ppbm (parts p...	Concept	stable
microgram per litre	ug.l-1	SI derived unit of mass concentration; SI base unit equivalen...	Concept	stable
microgram per cubic metre	ug.m-3	SI derived unit of mass concentration; SI base unit equivalen...	Concept	stable
micrometre	um	SI prefixed unit of length; SI base unit equivalent: 1E-6 m	Concept	stable
cubic micrometre per cubic centimetre	um3.cm-3	SI derived unit of volume fraction, equivalent to pptv (parts...	Concept	stable
micromole per kilogram	umol.kg-1	SI derived unit of amount per unit mass; SI base unit equival...	Concept	stable
micromole per litre	umol.l-1	SI derived unit of amount concentration; SI base unit equival...	Concept	stable
micromole per mole	umol.mol-1	SI derived unit of mole fraction; SI base unit equivalent: 1E...	Concept	stable
unknown	unknown	The correct value is not known to, and not computable by, the...	Concept	stable
week	week	Conventional unit of time, equivalent to 604800 s	Concept	stable