NoL296/52 OfficialJournaloftheEuropean Communities 15.10.81
CORRIGENDA
Corrigendum toCouncilDirective 80/181/EECof20December 1979ontheapproximation
ofthelawsoftheMemberStatesrelatingtounitsofmeasurement andontherepealof
Directive 71/354/EEC
(OfficialJournaloftheEuropean Communities NoL39of15February 1980)
Page43:theAnnexshallbereplacedbythefollowing :
ANNEX
CHAPTER I
LEGALUNITSOFMEASUREMENT REFERRED TOINARTICLE 1(a)
1.SIUNITSANDTHEIRDECIMAL MULTIPLES ANDSUBMULTIPLES
1.1.SIbaseunits
QuantityUnit
Name Symbol
Length metre m
Mass kilogram kg
Time second s
Electriccurrent ampereA
Thermodynamic temperature kelvin K
Amount ofsubstance mole mol
Luminous intensity candela cd
Definitions ofSIbaseunits:
Unitoflength
Themetreisthelengthequalto1650763-73wavelengths invacuumoftheradiationcorres­
pondingtothetransition betweenthelevels2p10and5d5ofthekrypton-86 atom.
(EleventhCGPM (1960),resolution 6).
Unitofmass
Thekilogramistheunitofmass;itisequaltothemassoftheinternational prototype ofthe
kilogram .
(ThirdCGPM(1901),page70oftheconference report).
Unitoftime
Thesecondisthedurationof9192631770periodsoftheradiationcorresponding tothe
transitionbetweenthetwohyperfine levelsofthegroundstateofthecaesium-133 atom.
(Thirteenth CGPM(1967),resolution 1).
Unitofelectriccurrent
Theampereisthatconstantcurrent,whichifmaintained intwostraightparallelconductors
ofinfinitelength,ofnegligiblecircularcross-section ,andplacedonemetreapartinvacuum ,
wouldproducebetweenthoseconductors aforceequalto2x10~'newtonpermetreof
length .
(CIPM(1946),resolution 2,approved bytheninthCGPM (1948)).

15.10.81 OfficialJournaloftheEuropeanCommunities NoL296/53
Unitofthermodynamic temperature
Thekelvin,unitofthermodynamic temperature ,isthefraction 1/273-16ofthethermody­
namictemperature ofthetriplepointofwater.
(Thirteenth CGPM(1967),resolution 4).
Unitofamountofsubstance
(1)Themoleistheamountofsubstance ofasystemwhichcontainsasmanyelementary
entitiesasthereareatomsin0-012kilogram ofcarbon12.
(2)Whenthemoleisused,theelementary entitiesmustbespecifiedandmaybeatoms,
molecules ,ions,electrons ,otherparticles,orspecifiedgroupsofsuchparticles .
(Fourteenth CGPM(1971),resolution 3).
Unitofluminousintensity
Thecandelaistheluminousintensity ,inagivendirection ,ofasourcethatemitsmonochro­
maticradiationoffrequency of540x10!:hertzandthathasaradiantintensityinthat
directionof(1/683)wattpersteradian .
(Sixteenth CGPM (1979),resolution 3).
1.1.1.SpecialnameandsymboloftheSIunitoftemperature forexpressing Celsius
temperature
QuantityUnit
Name Symbol
Celsiustemperature degreeCelsius °C
Celsiustemperature tisdefinedasthedifference t=T—T~betweenthetwother­
modynamic temperatures TandTQwhereT„=273-15kelvins.Anintervalofor
difference intemperature .naybeexpressedeitherinkelvinsorindegreesCelsius .The
unit'degreeCelsius'isequaltotheunit'kelvin'.
1.2.OtherSIunits
1.2.1.SIsupplementary units
Unit
Quantity
Name Symbol
Planeangle radian rad
Solidangle steradian sr
(EleventhCGPM,1960,resolution 12).
Definitions ofSIsupplementary units:
Unitofplaneangle
Theradianistheplaneanglebetweentworadiiofacirclewhichcutoffonthe
circumference anarcequalinlengthtotheradius.
(International standardISO31-1,December 1965).
Unitof¡olidangle
Thesteradian isthesolidanglewhich,havingitsvertexatthecentreofasphere,cuts
offanareaonthesurfaceofthesphereequaltothatofasquarewithsidesoflength
equaltotheradiusofthesphere.
(International standardISO31-1,December 1965).
1.2.2.SIderivedunits
Unitsderivedcoherently fromSIbaseunitsandSIsupplementary unitsaregivenas
algebraicexpressions intheformofproductsofpowersoftheSIbaseunitsand/orSI
supplementary unitswithanumerical factorequalto1.

NoL296/54 OfficialJournaloftheEuropeanCommunities 15.10.81
1.2.3.SIderivedunitshavingnamesandsymbols
Unit Expression
Quantity
Name SymbolInother
SIunitsIntermsofSIbase
orsupplementary
units
Frequency hertz Hz s—1
Force newton N m·kg■s—2
Pressure ,stress pascal Pa N-m—2m-1·kg·s—2
Energy,work;
quantityofheat joule J N-tn m2■kg■s—2
Power('),radiantflux watt W J-s-1m2·kg·s—3
Quantityofelectricity ,
electriccharge coulomb C s·A
Electricpotential ,
potentialdifference ,
electromotive force volt V W-A-'m2·kg·s-'·A—1
Electricresistance ohm Ω V-A-1m2■kg·s-'■A—2
Conductance siemens S A-V-1m—2·kg—1·s3·A2
Capacitance farad F Cv-1m—2·kg-'·s4·A2
Magnetic flux weber Wb V-s m2·kg■s—2·A—1
Magnetic fluxdensity tesla T Wb-m-2kg■s—2·A-1
Inductance henry H Wb·A-1m2·kg·s—2·A—2
Luminous flux lumen lm cd-sr
Illuminance lux lx lm·m—2m—2·cd·sr
Activity
(ofaradionuclide ) becquerel Bq s—1
Absorbed dose,specific
energyimparted ,
kerma,absorbed dose
index gray GyJ-kg 'm2·s-2
Doseequivalent sievert Svjkg-1m2·s—2
(')Specialnamesfortheunitofpower:thenamevolt-ampere (symbol'VA)whenitisusedto
expresstheapparentpowerofalternating electriccurrent,andvar(symbol 'var')whenitisused
toexpressreactiveelectricpower.The'var'isnotincludedinCGPMresolutions .
UnitsderivedfromSIbaseunitsorsupplementary unitsmaybeexpressed intermsof
theunitslistedinChapter I.
Inparticular ,SIderivedunitsmaybeexpressed bythespecialnamesandsymbols
givenintheabovetable;forexample ,theSIunitofdynamicviscositymaybe
expressed asm—!•kg•s—"orN•s■m-2orPa•s.
1.3.Prefixesandtheirsymbolsusedtodesignate certaindecimalmultiples andsub­
multiples
Factor Prefix Symbol Factor Prefix Symbol
IO'8 exa E io-1 deci d
10" peta P io-2 centi c
IO12 tera T 10-' milli m
10' giga G 10-6 micro μ
IO6 megaM 10-' nano n
10' kilo k 10-12 pico P
IO2 hecto h 10-" femto f
10' deca da jo-i.« atto a
Thenamesandsymbolsofthedecimalmultiplesandsubmultiples oftheunitofmassare
formedbyattachingprefixestotheword'gram'andtheirsymbolstothesymbol'g'.
Whereaderivedunitisexpressed asafraction,itsdecimalmultiplesandsubmultiples may
bedesignated byattaching aprefixtounitsinthenumerator orthedenominator ,orinboth
theseparts.
Compound prefixes ,thatistosayprefixesformedbythejuxtaposition ofseveraloftheabove
prefixes ,maynotbeused.

15.10.81 OfficialJournaloftheEuropeanCommunities NoL296/55
1.4.Specialauthorized namesandsymbolsofdecimalmultiplesandsubmultiples ofSI
units
QuantityUnit
Name Symbol Value
Volume litre 1orL(') 11=1dm1=10-3m1
Mass tonne t 1t=1Mg=103kg
Pressure ,stress bar bar(2) 1bar=105Pa
(')Thetwosymbols'1'and'Lmaybeusedforthelitreunit.
(Sixteenth CGPM(1979),resolution 6).
(2)UnitlistedintheInternational BureauofweightsandMeasuresbookletasamongtheunitstobe
permitted temporarily .
Note:Theprefixesandtheirsymbolslistedin1.3maybeusedinconjunction withtheunits
andsymbolscontained inTable1.4.
2.UNITSWHICH AREDEFINED ONTHEBASISOFSIUNITSBUTARENOTDECIMAL
MULTIPLES ORSUBMULTIPLES THEREOF
QuantityUnit
Name Symbol Value
Planeangle revolution *(')(a) 1revolution =2πrad
grade*orgon* gon* 1gon=——rad
200
degree 1°=-ILrad
180
minuteofangle Γ-πrad
10800
secondofangle1"=71rad
648000
Time minute min 1min=60s
hour h 1h=3600s
day d 1d=86400s
(')Thecharacter (*)afteraunitnameorsymbolindicatesthatitdoesnotappearinthelistsdrawnupbythe
CGPM,CIPMorBIPM.ThisappliestothewholeofthisAnnex.
(a)Nointernational symbolexists.
Note:Theprefixeslistedin1.3mayonlybeusedinconjunction withthenames'gradeor'gon'
andthesymbol'gon'.
3.UNITSDEFINED INDEPENDENTLY OFTHESEVEN SIBASEUNITS
Theunifiedatomicmassunitisone-twelfth ofthemassofanatomofthenuclide 12C.
Theelectronvolt isthekineticenergyacquiredbyanelectronpassinginavacuumfromonepoint
toanotherwhosepotential isonevolthigher.
Unit
Quantity
Name Symbol Value
Mass unifedatomicmassunit u 1u«1-6605655x10-27kg
Energy electronvolt eV leV«1-6021892xIO-'9J
Thevalueoftheseunits,expressed inSIunits,isnotknownexactly .
TheabovevaluesaretakenfromCODATA BulletinNo11ofDecember 1973oftheInternational
Council ofScientific Unions .
Note:Theprefixesandtheirsymbolslistedin1.3maybeusedinconjunction withthesetwo
unitsandwiththeirsymbols .

NoL29656 OfficialJournaloftheEuropeanCommunities 15.10.81
4.UNITSANDNAMESOFUNITSPERMITTED INSPECIALIZED FIELDSONLY
QuantityUnit
Name Symbol Value
Vergency ofopticalsystems dioptre" 1dioptre=1m-1
Massofpreciousstones metriccarat 1metriccarat=2xlO-^kg
Areaoffarmland and
buildingland are a 1a=102m2
Massperunitlengthof
textileyarnsandthreads tex" tex*1tex=10-*kg■m-1
Note:Theprefixeslistedin1.3maybeusedinconjunction withtheaboveunits.Themultiple
102ais,however ,calleda'hectare'.
5.COMPOUND UNITS
Combinations oftheunitslistedinChapterIformcompound units.

15.10.81 OfficialJournaloftheEuropeanCommunities NoL296/57
CHAPTER II
LEGALUNITSOFMEASUREMENT REFERRED TOINARTICLE 1(b)
QUANTITIES ,NAMESOFUNITS,SYMBOLS ANDVALUES
QuantityUnit
Name Symbol Value
Bloodpressure millimetre of
mercury (*)mmHgO 1mmHg=133-322Pa
Planeangle g'C)1«=—Í—rad
200
Activity
(ofaradionuclide ) curie Ci1Ci=3-7xIO10Bq
Absorbed dose rad rad(2) 1rad=IO-2Gy
Doseequivalent rem* rem* 1rem=IO-2Sv
Exposure(Xandγrays)röntgen R1R=2-58·IO-4C·kg-1
Dynamicviscosity poise P 1P=10-'Pas
Kinematic viscosity stokes St 1St=IO-4m2·s-1
(')Symbolfor'grade .
(2)Whenthereisriskofconfusion withthesymbolforradian,rdmaybeusedassymbolforrad.
NoteTheprefixesandtheirsymbolslistedin1.3ofChapterImaybeusedinconjunction withthe
unitsandsymbolscontained inthissection,withtheexception ofmillimetre ofmercuryand
itssymbolandthesymbol'g'.
UntilthedateindicatedinArticle 1(b),theunitslistedinChapterIImaybecombined witheach
otherorwiththoseinChapterItoformcompound units.

NoL296/58 OfficialJournaloftheEuropeanCommunities 15.10.81
CHAPTER III
LEGALUNITSOFMEASUREMENT REFERRED TOINARTICLE 1(c)
QUANTITIES ,NAMESOFUNITS,SYMBOLS ANDAPPROXIMATE VALUES
Length
inch 1in =2-54x10-2m
foot 1ft =0-3048m
fathom(')1fm 1-829m
mile 1mile =1609m
yard 1yard=0-9144m
Area
squarefoot 1sqft=0-929x10"1m2
acre 1ac =4047m2
squareyard 1sqyd=0-8361m2
Volume
fluidounce 1floz =28-41x10~6m3
gill 1gill=0-1421x10-3m3
pint 1pt=0-5683x10-3m3
quart 1qt=1-137x10-3m'
gallon 1gal=4-546x10-3m3
Mass
ounce(avoirdupois )1oz =28-35x10—3kg
troyounce1oztr =31-10x10-3kg
pound1lb =0-4536kg
Energy
therm 1therm =105-506x106J
(')Formarinenavigation only.
UntilthedatetobefixedunderArticle 1(c),theunitslistedinChapterIIImaybecombined with
eachotherorwiththoseinChapter Itoformcompound units.