B 1278
B 1278
L.N. 190 of 2020
METROLOGY ACT
(CAP. 454)
Metrology Act (First Schedule Amendment) Regulations, 2020
IN EXERCISE of the powers conferred by article 19(2) of the
Metrology Act, the Minister responsible for the Malta Competition
and Consumer Affairs Authority, on the advice of the MaltaCompetition and Consumer Affairs Authority, has made the follow ing
regulations:-
Citation.
Cap. 454.1. The title of these regulations is the Metrology Act (First
Schedule Amendment) Regulations, 2020 and these regulations sha ll
be read and construed as one with the First Schedule to the Metrology
Act, hereinafter referred t o as "the First Schedule".
Scope. 2. These regulations implement the provisions of Commission
Directive 2019/1258/EU of 23rd July 2019, amending, for the purpose
of its adaptation to technical progress, the Annex to Council D irective
80/181/EEC as regards the definitions of SI base units.
Amends Part 1 
of the First 
Schedule to the 
Metrology Act.3. Part 1 of the First Schedule to the Metrology Act shall be
amended as follows:
(a) item 1.1 thereof shall be substituted by the following:
"1.1 SI base units
QUANTITY UNIT
Name Symbol
Time second s
Length metre m
Mass kilogram kg
Electric current ampere A
Thermodynamic 
temperaturekelvin K
Amount of substance mole mol
Luminous intensity candela cd
VERŻJONI ELETTRONIKA
B 1279
B 1279
Definitions of SI base units:
Unit of time 
The second, symbol s, is the SI unit of time. It is
defined by taking the fixed numerical value of the caesium
frequency , the unperturbed ground-state hyperfine
transition frequency of the caesium 133 atom, to be 9 192631 770 when expressed in the unit , which is equal to
s–1.
Unit of length 
The metre, symbol , is the SI unit of length. It is defined
by taking the fixed numerical value of the speed of light in va cuum
 to be 299 792 458 when expressed in the unit , where the
second is defined in terms of .
Unit of mass 
The kilogram, symbol , is the SI unit of mass. It is
defined by taking the fixed numerical value of the Planck
constant  to be 6.626 070 15 × 10–34 when expressed in
the unit J s, which is equal to kg m2 s–1, where the metre
and the second are defined in terms of  and .
Unit of electric current
The ampere, symbol A, is the SI unit of electric
current. It is defined by taking the fixed numerical value of
the elementary charge  to be 1.602 176 634 × 10–19 when
expressed in the unit C, which is equal to A s, where the
second is defined in terms of .
Unit of thermodynamic temperature 
The kelvin, symbol K, is the SI unit of
thermodynamic temperature. It is defined by taking the
fixed numerical value of the Boltzmann constant  to be1.380 649 × 10
–23 when expressed in the unit J K–1, which
is equal to kg m2 s–2 K–1, where the kilogram, metre and
second are defined in terms of ,  and .
Unit of amount of substance 
The mole, symbol mol, is the SI unit of amount of
substance. One mole contains exactly 6.022 140 76 × 1023
elementary entities. This num ber is the fixed numerical
VERŻJONI ELETTRONIKA
B 1280
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€027B 1280
value of the Avogadro constant, , when expressed in the
unit mol–1 and is called the Avogadro number.
The amount of substance, symbol n, of a system is a
measure of the number of speci fied elementary entities. An
elementary entity may be an atom, a molecule, an ion, an
electron, any other particle or specified group of particles.
Unit of luminous intensity 
The candela, symbol cd, is the SI unit of luminous
intensity in a given direction. It is defined by taking the
fixed numerical value of the luminous efficacy of
monochromatic radiation of frequency 540 × 1012 Hz, ,
to be 683 when expressed in the unit lm W–1, which is
equal to cd sr W–1, or cd sr kg–1 m–2 s3, where the
kilogram, metre and second are defined in terms of ,  and
;
 (b) item 1.1.1 thereof shall be substituted by the
following:
"1.1.1. Special name and symbol of the SI derived
unit of temperature for expressing Celsius temperature
Celsius temperature t is defined as the difference t = T
– T0 between the two thermodynamic temperatures T and
T0 where T0 = 273.15 K. An interval or difference of
temperature may be expressed either in kelvins or indegrees Celsius. The unit "degree Celsius" is equal to the
unit "kelvin".".QUANTITY UNIT
Name Symbol
Celsius temperature degree Celsius °C
VERŻJONI ELETTRONIKA