NoL344/28 OfficialJournaloftheEuropeanCommunities 14.12.76
CORRIGENDA
Corrigendum toCouncilDirective 76/770/EECof27July1976amending Directive
71/354/EEContheapproximation ofthelawsoftheMemberStatesrelatingtounitsof
measurement
(OfficialJournaloftheEuropeanCommunities ,NoL262of27September 1976,page204)
SomeerrorsappearintheAnnextotheDirectivereferredtoabove.Forreasonsofform,the
correctedversionofthewholeAnnexispublished below.
ANNEX
LISTOFCONTENTS
ChapterA:Unitsofmeasurement ,theuseofwhichmustbemademandatory asfrom21April
1978atthelatest
1. SIunitsandtheirdecimalmultiplesandsubmultiples .
1.1. SIbaseunits.
1.2. OtherSIunits.
1.3. Prefixesandtheirsymbolsusedtodesignatecertaindecimalmultiplesand
submultiples .
1.4. Specialauthorized namesandsymbols .
2. UnitsdefinedonthebasisofSIunitsbutnotdecimalmultiplesorsubmultiples
thereof .
3. Unitsdefinedindependently ofthesevenSIbaseunits.
4. Unitsandnamesofunitspermitted inspecialized fieldsonly.
5. Compound units.
ChapterB:Unitsofmeasurement referredtoinArticle1(2)
6. Specialunits.
7. Specialcaseoftemperature .
8. Imperialunits.
ChapterC:Unitsofmeasurement referredtoinArticle1(3)
9. Imperialunits.
10. CGSunits.
11. Otherunits.
ChapterD:Units,namesandsymbolsreferredtoinArticle1(4)
12. Imperialunits.
13. Otherunits.
14. Compound units(fortemporary use).

14.12.76 OfficialJournaloftheEuropeanCommunities NoL344/29
CHAPTER A
UNITSOFMEASUREMENT THEUSEOFWHICH MUSTEEMADEMANDATORY AS
FROM 21APRIL1978ATTHELATEST
1.SIUNITSANDTHEIRDECIMAL MULTIPLES ANDSUBMULTIPLES
1.1.SIbaseunits
QuantityUnit
Name Symbol
Length metre m
Mass kilogram kg
Time second s
Electriccurrent ampere A
Thermodynamic temperature kelvin K
Amount ofsubstance mole mol
Luminous intensity candela cd
Definitions ofSIbaseunits:
Unitoflength
Themetreisthelengthequalto1650763-73wavelengths invacuumoftheradiation
corresponding tothetransition betweenthelevels2p10and5d5ofthekrypton86atom.
(EleventhCGPM (I960),resolution 6).
Unitofmass
Thekilogramistheunitofmass;itisequaltothemassoftheinternational prototypeof
thekilogram .
(ThirdCGPM (1901),page70oftheconference report).
Unitoftime
Thesecondisthedurationof9192631770periodsoftheradiationcorresponding to
thetransition betweenthetwohyperfine levelsofthegroundstateofthecaesium133
atom.
(Thirteenth 'CGPM(1967),resolution 1).
Unitofelectriccurrent
Theampereisthatconstantcurrentwhichifmaintained intwostraightparallelconductors
ofinfinitelength,ofnegligible circularcross-section andplacedonemetreapartina
vacuum,wouldproducebetweentheseconductors aforceequalto2x10~7newton
permetreoflength.
(CIPM(1946),resolution 2,approved bytheninthCGPM(1948)).

NoL344/30 OfficialJournaloftheEuropean Communities 14.12.76
Unitofthermodynamic temperature
Thekelvin,unitofthermodynamic temperature ,isthefraction 1/273-16ofthethermo­
dynamictemperature ofthetriplepointofwater.
(Thirteenth CGPM (1967),resolution 4).
Unitofamountofsubstance
Themoleistheamountofsubstance ofasystemwhichcontainsasmanyelementary enti­
tiesasthereareatomsin0-012kilogramofcarbon12.
Whenthemoleisusedtheelementary entitiesmustbespecifiedandmaybeatoms,mole­
cules,ions,electrons ,otherparticlesorspecifiedgroupsofsuchparticles .
(Fourteenth CGPM (1971),resolution 3).
Unitofluminousintensity
Thecandelaistheluminous intensity ,intheperpendicular direction ,ofasurfaceof
1/600000squaremetreofablackbodyatthetemperature offreezingplatinumunderapres­
sureof101325newtonspersquaremetre.
(Thirteenth CGPM (1967),resolution 5).
1.1.1.SpecialnameandsymboloftheSIunitoftemperature forexpressing Celsius
temperature
QuantityUnit
Name Symbol
Celsiustemperature degreeCelsius °c
Celsiustemperature tisdefinedasthedifference t=T—T0betweenthetwo
thermodynamic temperatures TandT0whereT0=273-15kclvins.Aninterval
ofordifference intemperature maybeexpressedeitherinkelvinsorin'degrees
Celsius.Theunitof'degreeCelsius'isequaltotheunit'kelvin'.
1.2.OtherSIunits
1.2.1.Supplementary SIunits
QuantityUnit
Name Symbol
Planeangle radian rad
Solidangle steradian sr
(EleventhCGPM,1960,resolution 12).
Definitions ofsupplementary SIunits:
Planeangleunit
Theradianistheplaneanglebetweentworadiiwhich,onthecircumference
ofacircle,cutanarcequalinlengthtotheradius.
(ISOrecommendation R31,PartI,secondedition,December 1965).

14.12.76 OfficialJournaloftheEuropeanCommunities NoL344/31
Solidangleunit
Thesteradian isthesolidanglewhichhasitsapexatthecentreofasphereand
whichdescribesonthesurfaceofthesphereanareaequaltothatofasquare
havingasitssidetheradiusofthesphere.
(ISOrecommendation R31,PartI,secondedition,December 1965).
1.2.2.Derived SIunits
Unitsderivedcoherently fromSIbaseunitsandsupplementary SIunitsaregiven
asalgebraicexpressions intheformofproductsofpowersoftheSIbaseunits
and/orsupplementary SIunitswithanumerical factorequalto1.
1.2.3.DerivedSIunitshavingspecialnamesandsymbols
Unit Expression
Quantity
Name SymbolInother
SIunitsIntermsofbase
orsupplementary
SIunits
Frequencyhertz Hz s-1
Force newton N m·kg·s-2
Pressure ,stress pascal Pa N·m-2m-1■kg·s-2
Energy,work,quantity
ofheat ioule J N·mm2·kg·s-2.
Power (]) watt W J-s"1m2·kg·s-3
Quantityofelectricity ,
electriccharge coulomb C s·A
Electrictension,electric
potential ,electromotive
force volt V W·A"1m2·kg·s-3·A-1
Electricresistance ohm Ω V·A"1m2·kg·s-3·A-2
Electricconductance siemens S A·V"1m-2·kg-1·s3·A2
Electriccapacitance farad F C·v-1m-2·kg-1·s4·A2
Magnetic flux weber Wb V·sm2·kg·s-2■A-1
Mangetic fluxdensity tesla T Wb·m"2kg·S-2·A-1
Electricinductance henry H Wb·A"1m2·kg·s"2·A"2
Luminous flux lumen lm cd·sr
Illuminance lux lx 1m·m-2m-2·cd·sr
Activity becquerel Bq s-1
Absorbed dose(?) gray Gy J·kg"1m2·s-2
i1)Specialnamesfortheunitofpower :thenamevolt-ampere (symbol'VA')whenitisusedto
expresstheapparentpowerofalternating electriccurrent,andvar(symbol'var')whenitisused
toexpressreactiveelectricpower.The'var'isnotincluded inCGPMresolutions .
('■)Andotherquantities ofionizingradiations ofthesamedimensions .
UnitsderivedfromSIbaseunitsmaybeexpressed intermsoftheunitslistedin
ChapterA.
Inparticular ,derivedSIunitsmaybeexpressed bythespecialnamesandsymbols
givenintheabovetable;forexample ,theSIunitofdynamicviscositymaybe
expressed asm-1•kg;•s-1orN•s•m--orPa•s.

NoL344/32 OfficialJournaloftheEuropeanCommunities 14.12.76
1.3.Prefixesandtheirsymbolsusedtodesignatecertaindecimalmultiplesandsubmultiples
Factor Prefix Symbol Factor Prefix Symbol
1018 exa E io-1 deci d
1015 peta P 10-2 centi C
1012 tera T 10-3 milli m
10» giga G 10-6 micro μ
10e mega M 10-9 nano n
IO8 kilo k 10-12 pico P
IO2 hecto h 10-15 femto f
IO1 deca da 10-18 atto a
Thenamesandsymbolsofthedecimalmultiplesandsubmultiples oftheunitofmassare
formedbyattachingprefixestotheworld'gram'andtheirsymbolstothesymbol'g'.
Whereaderivedunitisexpressed asafraction,itsdecimalmultiplesandsubmultiples
maybedesignated byattaching aprefixtounitsinthenumerator orthedenominator ,
orinboththeseparts.
Compound prefixes,thatistosayprefixesformedbythejuxtaposition ofseveralofthe
aboveprefixes,maynotbeused.
1.4.Specialauthorized namesandsymbols
1.4.1.Specialnamesandsymbolsofdecimalmultiplesandsubmultiples ofSIunits
QuantityUnit
Name Symbol Value
Volume litre 1 11=1dm8=IO"3m3
Mass . tonne t 1t=1Mg=10akg
Pressure ,stress bar bar 1bar=105Pa
1.4.2.Specialnamesandsymbolsofdecimalmultiplesandsubmultiples ofSIunits
whichmaybeusedonlyinspecialized fields
QuantityUnit
Name Symbol Value
Areaoffarmland and
buildingland are a 1a=102m2
Massperunitlengthof
textileyarnsandthreads tex*(1) tex* 1tex=10-6kg·m-1
i1)Thecharacter *afteraunitnameorsymbolindicatesthatthesedonotappearinthelistsdrawn
upbytheCGPM,CIPM,orB1PM.ThisappliestothewholeofthisAnnex.
Note:Theprefixesandtheirsymbolslistedin1.3maybeusedinconjunction
withtheunitsandsymbolscontained inTables1.4.1and1.4.2.
Themultiple102ais,however,calleda'hectare'.

14.12.76 OfficialJournaloftheEuropeanCommunities NoL344/33
2.UNITSWHICH AREDEFINED ONTHEBASISOFSIUNITSBUTARENOTDECIMAL
MULTIPLES ORSUBMULTIPLES THEREOF
71
71QuantityUnit
Name Symbol Value
Planeangle revolution *(a) 1revolution =2τιrad
grade*orgon*gon* 1gon=radB200
degreeo 1«^
180
minuteofangle/r10800rad
secondofanglenr648000rad
Time minute min 1min-=60s
hour h 1h■=3600s
day d 1d=86400s71
71
(a)Nointernational symbolexists.
Note:Theprefixeslistedin1.3mayonlybeusedinconjunction withthenames'grade'or
'gon'andthesymbolsonlywiththesymbol'gon'.
3.UNITSDEFINED INDEPENDENTLY OFTHESEVEN SIBASEUNITS
Theunifiedatomicmassunitisone-twelfth ofthemassofanatomofthenuclide 12C.
Theelectronvolt isthekineticenergyacquiredbyanelectronpassinginavacuumfromone
pointtoanotherwhosepotential isonevolthigher.
QuantityUnit
Name Symbol Value
Mass unifiedatomicmassunit U1u«1-6605655x10~27kg
Energy ¡electronvolt eV 1eV«1-6021892x10~19J
Thevalueoftheseunits,expressed inSIunits,isnotexactlyknown.
TheabovevaluesaretakenfromCODATA BulletinNo11ofDecember 1973oftheInter­
nationalCouncilofScientific Unions .
Note:Theprefixesandtheirsymbolslistedin1.3maybeusedinconjunction withthesetwo
unitsandwiththeirsymbols .
4.UNITSANDNAMESOFUNITSPERMITTED INSPECIALIZED FIELDSONLY
QuantityUnit
Name Value
Vergencyofopticalsystems dioptre* 1dioptre=1m-1
Massofpreciousstones metriccarat 1metriccarat—2x10-4kg
Note:Theprefixeslistedin1.3maybeusedinconjunction withtheaboveunits.
5.COMPOUND UNITS
Compound unitsareformedbycombining theunitsmentioned inChapterA.

NoL344/34 OfficialJournaloftheEuropeanCommunities 14.12.76
CHAPTER B
UNITSOFMEASUREMENT REFERRED TOINARTICLE 1(2)
6.SPECIAL UNITS
Quantities ,namesofunits,symbolsandvalues:
6.1.Volume (forestryandtimberindustry )
Festmeter *
Raummeter '1Fm*=1m3
1Rm*=1m3
6.2.Force
kilogramforce
kilopond *1kgfJ
1kp*I9-80665N
6.3.Pressure
101325
torr 1torr=760Pa
1at*=98066.5Pa
1mll.04---9806-65 Patechnicalatmosphere *
metreofwater*
(conventionally :1mH20)
millimetre ofmercury"(')
(conventionally :1mmHg)1nunHg*■133-322Pa
6.4.Power
Pferdestjrke *
paardekracht *
chevalvapeur*
cavallovapore*1PS*
1pk*
1CV*
1cv*735-49875W
6.5.Quantityofheat
calorie15°C
thermie *
frigorie*1ca)*i5-41855J
1th*-4-1855x106J
1fg»-4-1855x103J
1calIT4-1868J
1cal*th=4-184JcalorieIT
thermo-chemical calorie
6.6.Luminance
stilb 1sb-----101cd•m-2
Note:Theprefixesandtheirsymbolslistedin1.3maybeusedinconjunction withtheunits
andsymbolscontained in6.5and6.6,withthetorrandwiththemetreofwater(see6.3.).
7.SPECIAL CASEOFTEMPERATURE
Thename'degreekelvinandthesymbol'°K'(insteadofkelvin,symbolK)maybeuseduntil31
December 1977.
(')Exceptwherethisunitisusedformeasuring bloodpressure (seeChapterC,sectionII).

OfficialJournaloftheEuropeanCommunities NoL344/35 14.12.76
8.IMPERIAL UNITS*
Quantities ,namesofunits,symbolsandapproximate values
8.1.Length
chain 1chain—20-12m
furlong 1fur—201-2m
nauticalmile(UK) 1nauticalmile—1853m
1lood—1012m28.2.Area
rood
8.3.Volume
cubicyard
bushel1cuyd-0-7646m3
1hu-36-37X10-3m3
8.4.Mass
dram 1dr=1-772x10~3kg
cental >■'<> 1ctl—45-36kg.
8.5.Pressure
inchofwater 1inH20-249-089Pa
8.6.Force
ton-force 1tonf--9-964x103N
8.7.Illuminance
footcandle 1ftcandle -■10*76lx
8.8.Speed
knot(UK) 1knot=0-51477m-s-'

14.12.76 NoL344/36 OfficialJournaloftheEuropeanCommunities
CHAPTER C
UNITSOFMEASUREMENT REFERRED TOINARTICLE 1(3)
9­IMPERIAL UNITS*
Quantities ,namesofunits,symbolsandapproximate values
1hand=0-1016m
1vd—0-9144m
1sqin=6-452X10~4m2
1sqyd=0-8361m2
1sqmile—2-59x10sm2
1cu111
1cuft
1cran==16-39X10"«ms
:0-0283m3
170-5X10"3m39.1.Length
hand
yard
92.Area
squareinch
squareyard
squaremile
9.3.Volume
cubicinch
cubicfoot
cran
9.4.Mass
grain
stone
quarter
hundredweight
ton
9.5.Force
pound-force
9.6.Energy1gr=0-0648X10-3kg
1st=6-35kg
1qr-=12-70kg
1cwt—50-80kg
1ton=1016kg
1lbf=4-448N
Britishthermalunit
footpound-force
therm1Btu=1055-06J
1ftlbf=1-356J
1therm=105-506X10*J
9.7.Power
1hp=745-7W horsepower
9.8.Temperature
degreeFahrenheit 1°F(i)K
10.COSUNITS
Quantities ,namesofunits,symbolsandvalues
QuantityUnit
Name Symbol Value
Force dyne dyn 1dyn=■ΙΟ-5N
Energy erg erg 1erg=IO-7J
Dynamicviscosity poise P 1p=IO"1Pa-s
Kinematic viscosity stokes St 1St=IO"4m2-s"1
Acceleration offree
fall gal Gal 1Gal=IO"2m-s"2

14.12.76 OfficialJournaloftheEuropeanCommunities NoL344/37
11.OTHER UNITS
Quantities ,namesofunits,symbolsandvalues
QuantityUnit
Name Symbol Value
"Wavelength ,atomic
distances ångström Λ 1A-IO-10m
Effectivecross*
sectional area barn b 1b--=IO"28m2
Mass quintal*(a) 1quintal—IO2kg
Pressure standard
atmosphere atm 1atm=101325Pa
Bloodpressure millimetre ofmer­
cury*(convention­
ally:1mmHg)mmHg* 1mmHg-133-322Pa
Volume (forestry
andtimbertrade) stere st 1st=1m3
(a)Nointernational symbolexists.
Note:Theprefixesandtheirsymbolslistedin1.3maybeusedinconjunction withtheunits
andsymbolscontained insections10and11,apartfromthe'quintal'.

NoL344/38 OfficialJournaloftheEuropeanCommunities 14.12.76
CHAPTER D
UNITS,NAMESANDSYMBOLS REFERRED TOINARTICLE 1(4)
12.IMPERIAL UNITS*
Quantities ,namesofunits,symbolsandapproximate values
12.1Length
inch
foot1in=2-54X10"2m
1ft=0-3048m
1fm=1*829m
1mile=1609mfathom(*)
1sqft=0-929X10"1m*
1ac=4047m2mile
12.2Area
squarefoot
acre
12.3.Volume
fluidounce
gill
pint1floz=28-41X10"«m*
1gill=0-1421XlO"3m8
1pt=0-5683XlO"8m8
1qt=1-137X10-8m8
1gal-4-546X10"8m8quart
gallon
12.4.Mass
1oz=28-35X10"8kg
1oztr=31-10x10"?kg
1lb=0-4536kgounce(avoirdupois )
troyounce
pound
(l)Formarinenavigation only.
13.OTHER UNITS
Quantities ,namesofunits,symbolsandvalues
QuantityUnit
Name Symbol Value
Activityofaradioactive
source curie Ci 1Ci=3-7XIO10Bq
Planeangle ·*(>)1«=mrad
Absorbed dose rad rd(2) 1rd=10-2Gy
Equivalent absorbeddoserem* rem* 1rem=1rd
Exposuretoionizing
radiations rontgen R 1R=2-58XIO"4C-kg"1!*(>)
(*)Symbolfor'grade*.
(*)Thesymbolrecommended bytheInternational BureauofWeightsandMeasures (BIPM)is'rad*.
Note:Theprefixesandtheirsymbolslistedin1.3maybeusedinconjunction withtheunits
andsymbolscontained inthissection,withtheexception of
14.COMPOUND UNITS (TOBEUSEDTEMPORARILY )
UntilthedatesindicatedinArticle1,theunitslistedinChapters B,CandDmaybeusedin
conjunction withoneanotherorwiththosecontained inChapterAtoformcompound
units.