Metrology Act (First Schedule Amendment) Regulations, 2020 (firstscheduleamendment)

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 Malta

Competition and Consumer Affairs Authority, has made the following

regulations:-

The title of these regulations is the Metrology Act (First

Schedule Amendment) Regulations, 2020 and these regulations shall

be read and construed as one with the First Schedule to the Metrology

Act, hereinafter referred to as "the First Schedule".

These regulations implement the provisions of Commission

Directive 2019/1258/EU of 23 rd July 2019, amending, for the purpose

of its adaptation to technical progress, the Annex to Council Directive

80/181/EEC as regards the definitions of SI base units.

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

kelvin

K

temperature

Amount of substance

mole

mol

Luminous intensity

candela

cd

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 9 192

631 770 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 vacuum

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 m 2 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 be

1.380 649 × 10 –23 when expressed in the unit J K –1 , which

is equal to kg m 2 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 × 10 23

elementary entities. This number is the fixed numerical

value of the Avogadro constant,

, when expressed in the

–1 and is called the Avogadro number.

unit mol

The amount of substance, symbol n, of a system is a

measure of the number of specified 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 × 10 12 Hz,

,

–1

to be 683 when expressed in the unit lm W , which is

equal to cd sr W –1 , or cd sr kg –1 m –2 s 3 , 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

QUANTITY

UNIT

Name

Symbol

Celsius temperature

degree Celsius

°C

Celsius temperature t is defined as the difference t = T

– T 0 between the two thermodynamic temperatures T and

T 0 where T 0 = 273.15 K. An interval or difference of

temperature may be expressed either in kelvins or in

degrees Celsius. The unit "degree Celsius" is equal to the

unit "kelvin".".

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