ARCHIVESHISTORIQUES
DELACOMMISSION
COLLECTION RELIEEDES
DOCUMENTS "COM"
COM(75)580
Vol.1975/0219

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COMMISSION OFTHEEUROPEAN
COM(75)580 final
Brussels,1erdecember "1975
Proposai fora
COUNCIL DIRECTIVE
AMENDING TEECOUNCIL DIRECTIVE OF18OCTOBER 1971
OKIKEAPPROXIMATION OFTHELAXSOFTHEMEMBER STATES RELATING
TOUNITSOFMEASUREMENT
(submitted totheCouncilbytheCommission )
COÎK75)530final

EXPLANATORY MEMORANDUM
When adopting theDirective ontheapproximation ofthelaws oftheMember
Statoe relating tounits ofmeasurement (7l/354/E3C)(l )on18October -1971 ,
'theCouncil included anumber ofunits ornames ofunits inaspecial chapter
andmade provision fortheir authorization toboreviewed by31December 1977 *
Upon theenlargement oftheCommunity asprovided forintheDocuments concerning
theaccession totheEuropean Communities oftheKingdom ofDenmark fIreland ,
theKingdom ofNorway andtheUnited Kingdom ofGreat Britain andNorthern
Ireland (2),that Directive wasamended andsupplemented soastotake into
account theunits ofmeasurement oftheImperial System that were inlawful
useintwoofthenewMember States ,These units were listed inaspecial
annex andtheCouncil decided that their future would bedetermined by
31August 1976 .
Finally ,theFifteenth General Conference ofWeights andMeasures held in
Paris between 26Mayand 2June 1975 made some additions totheinternational
system ofunits (theSIsystem )which needed tobeincorporated inCommunity
legislation .
This Directive does notradioally amend theDirective adopted in1971 "but
brings ituptodate inaccordance with Decisions oftheCouncil andResolutions
oftheGeneral Conference ofWeights andMeasures .
Theunits inquestion areclassified under four chapters :
-Chapter A1Units ofmeasurement theuseofwhich isdefinitively authorized ;
-Chapter B:Units ,names andsymbols which areto^disappear from useas
soon aspossible ,andatthelatest by31December 1977 ;
-Chapter C:Units ,names andsymbols which aretodisappear from useas
soon aspossible ,andatthelatest by31December 1979 ?
-Chapter D:Units ,names andsymbols which aretodisappear from useas
soon aspossible butauthorization ofwhich istobereviewed
"by31Dcoember 1979 »
(1)OJnoL243 ,29October 1971 ,P.29
(2)OJnoL73,27March 1972 ,p.119

-2-
Chapter Alists "the "baso units oftheSIsystem andalso thesupplementary
units ,derived units andtheunits defined onthebasis oftheSisystem ,
inaccordance with thelatest decisions oftheGeneral Conference ofWeights
and Measures .
Inaddition totheunits already mentioned inthe1971 Directive asunits
which axetodisappear from usebytheendof1977 atthelatest ,Chapter B
lists anumber oftheunits ofthoImperial System .
Chapter Clisi<s most ofthounits which arctoboreexamined
before theendof1977 andalsonumerous units oftheImperial
System .
Finally ,thelast chapter lists theunits used inthefield ofradioactivity
which arenotpart oftheSIsystem ,Care must however ,betaken when replacing
these units bytheSIunits recently adopted in1975 by "theGeneral Conference
ofWeights andMeasures inview ofthedangers tohealth that could result
from anyerrors inthis field . '
Italso lists some oftheunits oftheImperial System which aretodisappear
from useeventually butwhich theUnited Kingdom andIreland areunable to
abolish intho immediate future because ofadministrative complications
(forexample alteration ofroad signs giving distances inmiles )orfor
psychological reasons (useofthe' p-'.nt etc.).Inthis field efficiency ,
which dictates that auniform system should beadopted within theCommunity
assoon aspossible ,should becoupled with theneed nottocause toodrastic
anupheaval ofdeep-rooted habits andnottoupset theeconomy orthecustoms
ofcertain lumber States byrunning bherisk oferrors occurring with
possibly unpleasant ,oreven dangerous consequences fortheir inhabitants .
Inanyevent -,theDirective clearly stipulates that such unite maynotbe
brought into usebyMember States yharo they arenotauthorised cnthe
date onwhich tho Directive enters into force .

-3-
Inshort,thetransition totheSIsystemofunitsinvolveseducatingthe
puolic-andnotonlyintheAnglo-Saxon countries-andcahnotbeeffected
intoodrasticafashion,* - •■; - .
Itisforthisreasonthatithasbeenconsidered necessarythatauthorization
oftheseparticular units,whicharelistedinChapterDandofwhichthere
are,moreover,veryfewshouldbereviewedinafewyearstimeantthatat
presentnodateshouldbefixedfortheirdisappearance fromuse.
Atallevents,inviewofthespecialsituation whichhasariseninthisfield
asaresultoftheenlargement oftheCommunity ,itwouldappearthat '
Directive asnowconceivedwillbringaboutanappreciable
improvement "inthisfield,whichissoimportantformutualunderstanding between
MemberStates,animprovement thatwillbeinlinewiththerecommendations ;
adoptedat-international levelbythemostcompetentscientificorganizations .
Finallyitisimportant torememberthatthisdirective likethedirective
adoptedin1971onlyconcernstheuseofunitsofmeasurement foreconomic ,
publichealth,'publiosafetyoradministrative purposes# Ofcourse,even
withintheselimits,areexcludedtheunitslaiddownbyinternational .
intergovernmental conventions oragreements inthefielsofairandsea
transport andrailtraffio.

PROPOSAL FORACOU1TCIL DIRECTIVE AMENDING THEOOUITCIL DIRECTIVE OP
18OCTOBER1971ONTHEAPPROXIMATION OPTHEL/IWSOPTHEMEMBERSTATES
REIAT.^ra TOUNITSOPMEASUREMENT
THEOOUITCIL OPTHEEUROPEAN COMMUNITIES ,
HavingregardtotheTreatyestablishing theEuropeanEconomic Community ,
andinparticular Article 100thereof;
Havingregardtotheproposal fromtheCommission ;
HavingregardtotheOpinion/"^oftheEuropeanParliament ;
(2HavingregardtotheOpinion 'oftheEoonomic andSocialCommittee ;
HavingregardtotheCouncilDirectiveofl8Ootober1971^onthe
approximation ofthelawsoftheMemberStatesrelatingtounitsof
measurement ;
(4HavingregardtotheTreatyofAccessionxT/,andinparticular Article29
thereofandtheamendments totheCouncilDirective ofl8October1971
contained inAnnexIthereto;
Whereas,pursuanttothesaidTreaty,theclassification inAnnexItothe
CouncilDirective ofl8October1971of'theunitscfmeasurement listed
inAnnexIItothatDirective istobedecidedonby31August197^atthe
latest;
Whereas,pursuanttotheCouncilDirective of18October1971onthe
approximation ofthelawsoftheMemberStatesrelatingtounitsof
measurement ,provision ismadeforthereviewbefore31Deoember1977
ofthesituation asregardstheunitsandnamesofunitslistedin
ChapterIIofAnnexItothatDirective ;
(1)0oJ#No
(2)0®J.No
(3)OaJ*NoL243,29October1971,P*29
(4)0eJ<,NoL73.27Ifexoh1972,p#119

Whereas thefifteenth General Conference ofWeights andMeasures "(CGPIi )f
convened on27May 1975 inParis bytheInternational Committee ofWeights
and I-loasi -ires radopted newinternational resolutions concerning the
international system ofunits ofmeasurement ;
HAS ADOPTSD THIS DIRECTIVE ï

Article 1
The-Council -Directive -of18October1971ontheapproximation ofthelaws
01theMemberStates "relatingtouniteof~measurement ""is.herebyamended
inaccordance withthefollowing Articles s
Article 2
Article 1isreplaced bythefollowing :
"1.MemberStatesshallmaketheprovisions ofChapter AoftheAnnex
bindingby21April1978atthelatest,
2.MemberStatesshall,witheffectfrom31December 1977atthelatest,
prohibittheuseoftheunitsofmeasurement listedinChapter Bof
theAnnex,
3,MemberStatesshall,witheffectfrom31December 1979atthelatest,
jprohibittheuseof ■theunitsofmeasurement listedinChapter C
oftheAnnex,
4,Theunitsofmeasurement temporarily retainedinaccordance withthe
provisions ofChapters B,CandDoftheAnnexmaynotbebrought
intocompulsory usebyMemberStateswheretheyhavenotbeen
authorized since21April1973#"
Article 3
nuI■■m«
ArjiexesIandIItotheDirective arereplaced bytheAnnexhereto*
Article 4
1,MemberStatesshallbringintoforcethelaws,regulations andadministrative
provisions neededinordertocomplywiththisDirective withineighteen
monthsofitsnotification andshallforthwith informtheCommission thereof,
2,MemberStatesshallcommunicate thetoxtsofthemainprovisions ofnational
lawwhichtheyadoptinthefieldcoveredbythisDirective tothe
Commission ,
Article 5
ThisDirective isaddressed totheMemberStates,

AN NEX
LIST OPGONTEWTS
Chanter AiUnits ofmeasurement laiddown inartiole 2paragraph 1ofthis
directive »
1. SIunits andtheir decimal multiples andBubmultiples
1*1* SIbase Units
1*2. Other SIunit s
1*3* Prefixes andtheir symbols
1*4* Special authorized names andsymbols
2. Units defined onthebasis ofSIunits
3* Units defined independently oftheBeven SIbase units
4. UnitB andnames ofunits permitted inspecialized fields only
5» Compound units
Chapter BtUnits ofmeasurement laiddownunartiole 2paragraph 2ofthis
directive
4 Spécial units
7» Speoial caBe asregards température
8« Imperial Units
Chapter (?tUnits oftneasurement laiddown inartiole 2paragraph 3ofthis
direot ive
9» Impérial units
10. C0Sunits
11* Other units
Chapter DtUnits ,names andsymbols whioh aretobereviewed hy31.12 *1979 *
12« Impérial units
13. Other units
^4* Compound units

CHAPTER A
UNITSOFMEASUREMENT LAIDPOVffTINARTICLE 2PARAGRAPH 1OPTHISDIRECTIVE
1.SIUNITSANDTHEIRDECIMAL MULTIPLES ANDSIJBMULTIPLES
1.1.SIbaseunita
QuantityUnit
Name Symbol
ILength metre m
Mass kilogramme kg
Time second s
Electric current ampere A
Thermodynamic temperature !kelvin K
Amountofsubstance mole mol
Luminousintensity candela cd
Définitions ofSIbaseunitst
Unitoflength
ThemetreisthelengthequaltoI65O763*73wavelengths
invacuumoftheradiation corresponding tothetransition
betweenthelevels2p10and5dcofthekrypton-86 atom*
(Eleventh CPGM(i960).Resolution 6).
Unitofmass
Thekilogramme isequaltothemassoftheinternational
prototype ofthekilogramme .
(ThirdCGPM(1901),p.62oftheConference Report).
Unitoftime
xhesecondisthedurationof9192631770periodsofthe
radiation corresponding tothetransition ,betweenthetwo
hyperfine levelsofthegroundstateofthecaesium-133
atom(Thirteenth CGPM(1967)tResolutionl).
Unitofeleotric current
Theampereisthatconstant ourrentwhichifmaintained in
twostraightparallel conductors ofinfinite length,of
negligible circularcross-section andplaced1metreapart
inavacuum,wouldproducebetweentheseconductors aforce
equalto2x10newtonpermetreoflength.
(CIPM(1946),Resolution 2approvedbytheNinthCGPM(1948))•

-3-
Unit ofthermodynamic temperature
Thekelvin isthefraction 1/273.16 ofthethermodynamic
temperature ofthetriple point ofwater .(Thirteenth CGPM
(1967 ),Resolution 4).
Unit ofamount ofsubstance
Themale istheamount ofsubstanoe ofasystem whioh
contains asmany elementary entities asthere areatoms
in0.012 kilogramme ofcarbon-12 .(Fourteenth CGPM (l97l)»
Resolution 3).
Note tWhen themole isused theelementary entities must be
specified andmaybeatoms rmolecules tions telectrons y
other partioles orspecified groups ofsuch partioles .
Unit_°f luminouB_intensity
Thecandela istheluminous intensity ,intheperpendicular
direotion ,ofasurface ofl/600000square metre ofablack
body atthetemperature offreezing platinum tinder apressure
of101325newtons persquare metre .(Thirteenth CGPM (1967 )1
Resolution 5)*
1.1.1 .Special name and symbol ofthe SIunit oftemperature
forexpressing Celsius temperature .
I Unit
I QuantityName Symbol Value
Celsius température degree
CelsiusC 1*C-1K
Celsius temperature tisdefined asthedifference
tmT-Tbetween thetwothermodynamic temperatures
TandTwhere TQ-273.15 K.
1«2«öther SIunits
1.2.1 .Supplementary SIunit s
iQuant ityUnit
Name Symbol
Plane angle radian rad
Solid angle steradian sr
r1– I

1*'2*'2*Darived SIunitB
Unitsderivedcoherently froSI"baseunitsandSIsupplementary
unitsaregivenasalgebraic expressions intheformsof
exponentials oftheSIbaseunitsandSIsupplementary units
withanumerioal factorequalto1#
1*2*3*SIunitshavingspecialnamesandsymbols
QuantitySIUnit
Name SymbolEquivalent
formDéfinition
Frequenoy .
Force
Pressure ,stress
Energy,work,quantity
ofheat
Power
Quantityofeleotrloity
oharge
Electriotension,electricpotential,I
electromotive force \
Eleatric résistance '
Electric oonduotanoe
Eleotriooapacitanoe
Eleotrio inductance
Magnetic flux
Magneticfluxdensity
Luminous flux
Illuminanoe
Radioaotivity
Absorbeddose(*)hertz
newton
pascal
joule .
watt
coulomb
volt
ohm
ciemenB •
farad
henry
webcr •
tesla,.v
lumen
lux
becquc.rcl
«rayIIz
H
Pa
J'
%
W
c
V ■
a
s
Ρ
II
vrb
-T
*
lm
Ix
Bq
Cy-1s
-2
m.kgs
N.m~2.
N,m
J.s*""1
s,A
W.A-1
V.A"1
A.V"1
c.v"1
V»sA"1
V.s
V/b.m2
cd,Br
n-2lm.m
-1
G
J.kg"1-1s
-2
m.kg,s
-1,-2m,kgg
2,-2m#kç,s
m2,ktf.s
s»A
2-3-1
m«kg,s»A
2-3-2
m•kf.s.A
-2*,-1J.2m,kg•F-»
-2,-1„4.2m»kg.v«\
p _2
m.ta;,s-«A
2,-2.-1m*kg,s«A
-2,-1kg,s»A
cd,ar
m*"2.-od,Br
"1
B
2-2
m,b
–––––––
TheSIunitofpowermaybecalledvolt–ampere(symbol'VA^
whenitisusedtoexpresstheapparentpowerofalternating
electriocurrent,andvar(symbol *var')whenitisusedto
expressreactiveeleotrio power*
^1^andotherquantities ofionisingradiations of*thesamedimensions *

!■:-*'à1«3«Prefixes andtheir symbols used todesignate oertain
deoimal multiples andsubmultiples
Factor Prefix Symbol PaotorPrefix j|Symbol
i _
1018exa E 10*" deci d
105peta P 10~2 • centi o
1012 tera T 10 milli m
109giga G 10-6 micro
i10° mega Mio"y nano n
103 kilo k .HT12 pico P
102 hecto h io-15 femto
101 deca da 10"18 atto a
Thenames andsymbols ofthedecimal multiples andsubmultiples
oftheunit ofthemass areformed byattaching prefixes tothe
word "gramme "andtheir symbols totheqymbol 'g**
Where aderived unit isexpressed asafraction ,itsdeoimal
multiples andsubmultiples maybedesignated byattaching a
prefix tounits inthenumerator ofthedenominator forin
both these parts **
Compound prefixes ,that istosayprefixes formed bythe
juxtaposition ofseveral oftheabove prefixes ,maynotbe
used *
1»4*Special authorized names andsymbols
1*4«1*' Special names andsymbols ofdeoimal multiples and
submultiples ofSIunits
QuantltyUNIT
Name Symbol Value
Volume IIlitre111*1dm3»10m
Mass 1tonne t 1t-lMg-103kg
Pressure ,Btress barbarJ1bar ■10Pa

l*4«2«Special namesandsymbolsofdecimalmultiples andsubmultiples
ofSIunitswhichmaybeusedonlyinspecialised fieldst
QuantityUnit |
Nanir|Symbol IValue I
Areaoffarmlandand-
buildingland arc ala8®102m2
Massperunitlengthofi
textileyarnsandthreads!M' tex*U)1tex"10-*kg»nj
: »
NoteiTheprefixes andtheirsymbolslistedinitem1»3»'may
beusedinconjunction withtheunitsandsymbols
containedinth^tablesofitems1*4*1»and1*4«'2»'
Themultiple 10ais,however,calleda'hectare'#
UNITSWHICHARBDEFINED CNTHEBASISOPSIUNITSBUTARBNOTDECIMAL
MULTIPLES ORSUBMULTIPLES THEREOF
Quanuty
' I• Unit |
Natnc Symbol |•Value |
Planeangle révolution * «• 1révolution–2nrad
grade*.
orgon* gon*ir
*1goti«-jnò"rad
degree* o ~~180ra
minuteofangle*0
S~10800rad
secondofangle*»# 1*s; ■-rad1648000rao
Time minute* min* 1mut=60s
hour 1h=3600s
day*
I vd* 1d«=86400s
'n,crn31'onalsymbolexistsatpresentalthoughtherear<nationalsymbolsandabbreviations ,suchas
note:Thepicfixcslisirdinitem1.3mayonlybeusedinconjunction withthenamesgrade
andgt.nandthesymbolsonlywiththesymbolgon.
I)oharaoter*afteraunitnameorsymbolindicatesthatthesehavenotyetappearedinthelistsdrawnup
bytheGOPMofCIPM«Thisappliestothewholeofthis
Annex.

-7-
3./UNITSDEFINED INDEFENDTLY OPTHESEVINSIBASEUNITS
Theunifiedj^omiomassunitis1/12ofthemassofanatomofthenuclide ,C.
Theeleotronvolt isthekineticenergyacquired byanelectron
passinginavacuumfromonepointtoanotherwhosepotential
is1volthigher*'
QuantityUnit
Name . SymbolApproximative value
Mass
Energyunified atomio
massunit*
eleotronvolt*
u
*
eVluS1.66053 •x10"'kg
leV>^1.60219*10~19J
Thevalueoftheseunits,expressed inSIunits,isnotexactly
known*
NotetTheprefixes andtheirsymbolslistedinitem1*3maybe
usedinconjunction withthesetwounitsandwiththeir
symbols *
4.UNITSANDNAMESOPUNITSPERMITTED INSPECIALIZED FIELDSCNLY
I
i
i
i
iQuantityUnit
Name Value
Vergency ofopticalsystems
Massofprecious stonesdioptre *
Metriccarat1dioptre-1m
–41metriooarat «■2x10kg
NotetTheprefixeslistedinitem1.3maybeusedin
conjunction withtheaboveunits.
k5*.COMPOUND UNITS
Compoundunitsareformedbyoombining theunitsmentioned
inChapter A,withtheexception ofthoselistedinitems
1*4*2*and4«(unitspermittedinspecialized fieldsonly)*
./

CHAPTER B
UNITSOPMEASUREMENT LAIDDOMIffARTICLE 2PARAGRAPH 2OPTHISDIRECTIVE
6.SPECIAL UNITS
Quantities !namesofunitsfsymbolsand
6,1.Volume..(f°r©i3tiyandtimberindustry)
Festmeter *
Raummeter * .
stere
6,2,Force
kilogramme force*
kilopond *•
6*3»pressure
it
torr*
technical atmosphere *
metreofwater*
(syrobolt1mHpO)
millimetre ofmercury *
(symbolj1mmHg)
6.4»Power
Pfcrdcstarke *
paardekracht *
chevalvapeur*
cavallovaporc*values :
6»5«Heat
Calorie*I.T,
thermie *
frigorie *
(usedtomeasureheatremoved
fromasystem)1Fm*=1m
l.Rm*),3
1st(-1ra
igf-9,80665H
!torr,.œPaibO
1at*'=98066.5Pa
1mHpO*=9806,65Pa
1mmHg*«133.322Pa
1PS*)
3.pk*(
1CV.)
1cv*(«735-498 75W
1cal*I.T.=4.1868J
1ΐΐι*β4-1868χ10.Τ
ι
1fg*=4.1868x10"J
6.6,Illuminaiice
stilb 1Bb=104od.hT2
NotetTheprefixesandtheirsymbolslistedinitem1.3.maybeused
inconjunction withtheunitsandsymbolscontained initems
6.5*and6,6.,withthestere(item6.I.),withthetorrand
withthemetreofwater(item6.3.).

-9-
7.SPECIAL CASE WITH REGARD TOTEMPERATURE
Thename'fiegree .Kelvin "andthesymbol _"KH(instead ofKelvinf
symbol K)maybeused until 31December 1977 *
8.IMPERIAL UNITS
Quantities ,names ofunits ,symbols andvalues ,*
8.1.Length
Hand
Chain
Furlong
Nautical Mile (UK)
8.2 ,Area
Rood
8^3 *Volume
«
Cubio yard
Buohel
8.4 .MaBs
Dram
Cent al
8.5 .Pressure
•Inch ofYJater
8.6»' Force
ïorrforco .
8.7.Power
Horeejpowor
8,8 -Illuminance''
Foot Candie
. . »
8.9»Speed
Knot (UK)1hand =0,1016 m
1chain =.20.12 m
1fur 'f201;2m
1nautical mile =1853 m
1rood =:1012 m
1cuydaO.7646 m "3
1bu : =36.37 x10 m
1dr«1,772 x10"3kg .
1ctl •*45.36 kg
1inH20.»249.039 Pa
1tonf =9.964 x10^H
1hp=745.7 W
1ftcandle -10,76 lx
1)cnot=0.51477-1
V

-10-
CHAPTER C
UNITSOFMEASUREMENT LAIDDOWETHTARTICLE 2PARAGRAPH 3OFTHIS~~ DIRECTIVE ~
IMPERIAL UNITS
Quantities ,namesofunits,
9.1.Lengrth .
Yard
9.;2;Area
Squareyard
Squaremile
9.3.Volume
CubicInch
Cubicfoot
Cran
9.4.Mass
Grain
Stone
*
Quarter
Hundredweight
Ton
9.5.Force
Poundrforcc
♦-«
9»"«Energy
British >ThermalUnit
FootPound-force
Themi
9*7»Température
DegreeFahrenheitsymboleandvalues:
1yd=0*9144 m
1sqyd=0,8361m
62
Xeqmile=2,59x10in
1cuine16.39x10
1cu'ft"a0.0283m3
-331cran=170*5x10m
1gr=0,06^8x10~*kg
lst=6.35
1qr 12.70kg
1cvrt=50.80kg
1ton«1016kg
1lbf=4.448H
1Btu-1055»06J
Xft'lbf»1.356J
1therm=105?50ox10^J
1°P=ê)x

4
-H-
si '
10,G0SUNITS
.Quantities ,namesofunits*symbolsandvalues %
/
Quantity it_Jnit
r~ –
iNarae Symbol 'jValue j
force rdyne' dvn 1dyn=10~5H
energy erg ;erg 1erg=10'J!
Idynamicvisoosity poise P '1P«10*Pa.s
•j
kinematic viscosity•.stokes*St*ISts10m.s
accélération duetogravity gai*Gai* 1Gai=10m.s
11.OTHERUNITS
QuantityUnit
N~mo Symbol Value
wavelength ,atomio
distances
effective cross-sectional
area j
mass '
I
pressure!
ingatroms
mrn .ap
mintal
[standard
[atmosphere (l'o
A*
•b*
cf*
atm1A-=10"1m
lb=10-20m2
1q=102kg
1atm«101.^25Pa
NoteJTheprefixes andtheirsymbolslistedinitem1.3.may­
beusedinconjunction withtheunitsandsymbols
contained initems10and11,apartfromthequintal.
; ./•
(l)Usedonlyforreference

-12-
CHAPTER D
12.UNITS,NAMESANDSYMBOLS WHICHARETOBEREVIEWED BY31.12.1979
IMPERIAL UNITS „
12,1,Length "*<«uan'ti'5ios»namesofunits,symbolsandvalues:
Inch
Foot ,
Fathom(l)
Mile
12.2*Area
13.SquareInch
Squarefoot
Acre .
12.3*Volume
Fluidounce
Gill
Pint •
«
Quart
Gallon
12,4.Mass
Ounce(avoirdupois )
Troyounce
Pound
OTHERUNITS1inc2,54x-10m
1ft«=0,3048 m
1fm.■1.829m
1mile»1609m
1eqinta6,452x10**^m
1sqft=*0.929xlO"1m
21ao«s4047m
1floz=28.41x10m3
ÌGill=0,1421xIO*"3m3
1pt»0,5682x10~3m3
1qt«=1,136xIO"3m3•
1gal=4.546xIO"3m3
1oz«28.35*10
1oztr«=31^10
l'lb-0,4536kg-3kg
31.10x10~3kg
–Quantities ,namesofunits,symbolsandvalues s
>■ –»–■»■«–»■>!
Quvifrity 4UnitJ
Name I"Ê&mbol Value
|Activityofaradioactive Icurie Ci 1Ci=3.7*101-1
B
source ,
Absorbed dose rad* rd*1rdtr10"2J.kg
Equivalent absorbed dose
Exposure toiomsingradiations _rem*
roentgen*renj*
R*1
1rem
R«=1Γβ,ά
2.58χ10"4
Note:Theprefixes andtheirsymbolslistedinitem1.3.maybeused
inconjunction withtheunitsandsymbolscontained initem13,
(1)Pormarinenavigaiiononly.

COMPOUND UNITS(FORTEMPORARY USE)
Whilestillvalid,theunitslistedinchapters B,CandD,
excluding items1«4*2«»4*and6,1maybeusedinconjunction
withoneanotherorwiththosecontained inchapter Atoform
oompoundunits.